SEO Glossary

301 Redirect A 301 redirect is a permanent HTTP redirect that sends users and search engines from one URL to another, passing nearly all link equity to the destination.

404 Error A 404 error means the requested page was not found on the server. It tells users and crawlers that the URL exists but has no content assigned to it.

AI Overview SEO Optimising content to be cited or featured within Google's AI-generated overview summaries at the top of search results. AI SEO AI SEO covers the impact of artificial intelligence on search — from Google's AI-powered ranking systems (BERT, MUM, RankBrain) to AI-generated content and optimising for AI Overview results. AI-Generated Content and SEO AI-generated content refers to text produced by artificial intelligence tools (like ChatGPT or Claude). Google's policy permits AI content if it is high-quality and helpful — but penalises low-quality, mass-produced AI content designed to manipulate rankings. AMP Pages Accelerated Mobile Pages — a framework for creating ultra-fast mobile web pages endorsed by Google. Above the Fold Above the fold refers to the portion of a web page visible to users without scrolling. Content placed above the fold is seen immediately, making it critical for user engagement, ad placement, and first impressions. Alt Text Alt text (alternative text) is an HTML attribute added to image tags that describes the image for screen readers, accessibility tools, and search engine crawlers. Anchor Tag The HTML anchor tag (<a href>) creates hyperlinks between web pages. The visible link text (anchor text) is an important on-page signal that tells search engines what the linked page is about. Anchor Text Anchor text is the visible, clickable text in a hyperlink. It signals to search engines what the linked page is about and plays an important role in both internal linking and link building. Anchor Text Diversity The practice of varying the anchor text used in backlinks to create a natural link profile. Author Authority Author authority (sometimes called authorship in SEO) refers to the credibility and expertise attributed to the person who wrote a piece of content. Strong author authority supports E-E-A-T and can improve rankings for YMYL topics.

BackRub BackRub was the original name of the research project by Larry Page and Sergey Brin at Stanford University that later became Google. Backlink A backlink is a hyperlink from one website pointing to another. Backlinks are one of the most important ranking factors in Google's algorithm. Backlink Audit A backlink audit reviews inbound-link sources, context and acquisition patterns to understand opportunities and documented risk. Backlink Disavow Backlink disavow is the process of submitting a file to Google telling it to ignore specific toxic or spammy backlinks pointing to your site, so they don't negatively affect your rankings. Black Hat SEO Black hat SEO refers to techniques that violate search engine guidelines to manipulate rankings — such as keyword stuffing, cloaking, and private blog networks. These risk manual penalties and deindexing. Bounce Rate Bounce rate is the percentage of sessions where a visitor leaves a site after viewing only one page without any interaction. In GA4, it replaced by engagement rate as the primary metric. Bounce Rate & SEO The relationship between the percentage of single-page sessions and organic search rankings. Brand SEO Brand SEO focuses on optimising a brand's online presence so it dominates search results for branded queries, builds positive reputation associations, and ensures accurate information appears when users search for the brand. Breadcrumb Navigation Breadcrumb navigation is a secondary navigation scheme showing the user's location in a website hierarchy. It appears in both the page UI and Google search results as SERP breadcrumbs. Breadcrumbs Breadcrumbs are a site navigation element that shows users their current location within a website's hierarchy. Search engines use breadcrumb schema to display structured breadcrumb trails in search results. Broken Link A broken link (dead link) is a hyperlink that points to a URL that returns an error — most commonly 404 Not Found — because the destination page no longer exists.

CDN – Content Delivery Network A Content Delivery Network (CDN) is a distributed network of servers that delivers web content from locations closest to each user, reducing load times and improving page speed. CLS – Cumulative Layout Shift Cumulative Layout Shift (CLS) is a Core Web Vital that measures visual stability — how much page elements unexpectedly move during loading. CTR (Click-Through Rate) CTR is the percentage of impressions that result in a click. In SEO, it measures how often users click your result when it appears in Google Search. Canonical Tag The canonical tag (<link rel="canonical">) tells search engines which version of a URL is the "master" copy when duplicate or similar content exists across multiple URLs. Click Depth Click depth (also called page depth) is the number of clicks required to reach a page from the homepage. Pages with lower click depth are crawled more frequently and receive more PageRank from the homepage. Click-Through Rate (CTR) Click-through rate (CTR) in SEO is the percentage of users who click on your search result after seeing it (impressions). A higher CTR means more organic traffic without needing to improve rankings. Clickbait in SEO Clickbait in SEO refers to misleading or sensational title tags and headlines designed to maximise clicks regardless of whether the content delivers what the title promises, which can damage trust and increase bounce rates. Competitive Keywords High-value search terms with significant competition from authoritative or well-funded websites. Competitor Analysis (SEO) SEO competitor analysis is the process of identifying and analysing the websites competing for the same search queries, to understand their strategies and find opportunities to outrank them. Competitor Backlink Analysis Competitor backlink analysis is the process of examining the backlink profiles of your top-ranking competitors to identify link opportunities, understand what types of content earn links in your niche, and build a more targeted link building strategy. Content Audit A content audit is a systematic review of all content on a website to evaluate its quality, performance, and relevance — identifying content to keep, improve, merge, or delete. Content Cluster (Pillar & Cluster Model) A content cluster is a group of interlinked pages covering a broad topic (pillar page) and all its subtopics (cluster pages), building topical authority and improving internal linking. Content Decay Content decay is the gradual decline in organic traffic and rankings that older content experiences over time as it becomes outdated, competitors publish fresher material, and search intent evolves. Content Freshness Content freshness is the degree to which a web page's content is up-to-date. Google uses freshness as a ranking factor (Query Deserves Freshness) for time-sensitive queries, favouring recently updated content. Content Gap Analysis Content gap analysis is the process of identifying keywords and topics that competitors rank for but your site does not, revealing opportunities to create new content that can capture missed organic traffic. Content Hub A content hub is a centralised section of a website dedicated to comprehensive coverage of a specific topic, bringing together pillar pages, guides, articles, and resources on that topic in one organised location. Content Marketing Content marketing is the strategic creation and distribution of valuable, relevant content to attract and retain a defined audience — and ultimately drive profitable customer action, with SEO as a key distribution channel. Content Marketing & SEO The integration of content marketing strategy with SEO to attract organic traffic and build brand authority. Content Pillar A content pillar is a comprehensive, long-form piece of content that covers a broad topic in depth and serves as the central hub for a content cluster, internally linking to more specific supporting articles. Content Pruning The process of removing, consolidating, or improving underperforming content to improve overall site quality and SEO. Content Repurposing Adapting existing content into new formats or channels to extend its reach and SEO value. Content Syndication Content syndication is the practice of republishing original content on third-party platforms or websites to reach a wider audience. In SEO, it requires canonical tags to prevent duplicate content issues. Conversion Rate Optimisation (CRO) CRO (Conversion Rate Optimisation) is the practice of increasing the percentage of website visitors who complete a desired action — such as a purchase, signup, or contact form — without increasing traffic. Core Web Vitals Core Web Vitals are a set of three user-experience metrics Google uses as ranking signals: LCP (loading), INP (interactivity), and CLS (visual stability). They are part of the Page Experience update. Crawl Budget Crawl budget is the number of URLs Googlebot will crawl on your site within a given timeframe. Managing it well ensures important pages are discovered and indexed efficiently. Crawl Budget Optimisation Managing how search engine crawlers spend their crawl allocation on your site to ensure important pages are indexed. Crawl Depth The number of clicks required to reach a page from the homepage, affecting how quickly Googlebot discovers and indexes it. Crawl Errors Crawl errors occur when search engine bots attempt to access a URL on your site but encounter a problem — such as a 404 Not Found, 5xx server error, or redirect loop — that prevents them from successfully fetching the page. Crawlability Crawlability is the ability of search engine bots to access and navigate a website's pages. A crawlable site has no critical technical barriers preventing Googlebot from discovering and indexing its content.

Digital PR Using public relations techniques online to earn high-authority editorial backlinks and brand mentions. Disavow The Disavow Tool is a Google Search Console feature that lets website owners tell Google to ignore specific backlinks when evaluating their site — used to clean up toxic or spammy link profiles. Dofollow Link A dofollow link is a standard hyperlink that instructs search engines to follow it and pass link equity (PageRank) to the linked page. It is the default type for all links unless explicitly specified otherwise. Domain Authority (DA) Domain Authority (DA) is a third-party SEO metric created by Moz that predicts how likely a website is to rank in search results, scored from 0 to 100. It is not a Google ranking factor. Domain Rating / Domain Authority Domain Rating (Ahrefs) and Domain Authority (Moz) are third-party metrics that estimate a website's overall link-based authority on a 0–100 scale. Higher scores indicate a stronger backlink profile. Duplicate Content Duplicate content refers to identical or substantially similar content appearing on multiple URLs — either within one site or across different sites. It confuses search engines and can dilute ranking signals. Dwell Time Dwell time is the length of time a user spends on a page after clicking a search result before returning to the SERP. Longer dwell time suggests the content satisfied the searcher's intent.

E-E-A-T Experience, Expertise, Authoritativeness, and Trustworthiness — Google's framework for evaluating content quality. Ecommerce SEO SEO strategies tailored to online stores, covering product pages, category pages, and shopping search features. Engagement Metrics in SEO Engagement metrics measure how users interact with a website — including time on page, pages per session, scroll depth, and bounce rate. Google uses behavioural signals as indirect indicators of content quality. Entity SEO Entity SEO is the practice of establishing your brand, people, and products as recognised entities in Google's Knowledge Graph, making your site more authoritative for relevant topics. Evergreen Content Content that remains relevant and valuable to readers long after its original publication date.

FAQ Schema FAQ schema is structured data markup that marks up a list of questions and answers on a page, potentially enabling Google to show an expanded FAQ rich result directly in search results — increasing SERP real estate. Faceted Navigation Faceted navigation is a filtering system on e-commerce and large content sites that allows users to narrow results by multiple attributes, often generating thousands of URL combinations that cause crawl budget waste and duplicate content issues. Featured Snippet A featured snippet is a box at the top of Google's search results (position 0) that directly answers a query, pulling content from a web page. Winning one can dramatically increase organic CTR. Featured Snippet Optimisation Featured snippet optimisation is the practice of structuring content to increase the chance of being selected by Google as the featured snippet (position zero) for a given query.

Geo-SEO Techniques for improving a site's visibility in search results for specific geographic locations or regions. Geo-Targeting Geo-targeting in SEO refers to the practice of specifying the intended geographic audience for a website or page, so that search engines serve the most relevant version to users in different countries or regions. Google Algorithm Google's search algorithm is a complex system of rules and signals used to rank web pages in search results. It consists of many components including Panda, Penguin, BERT, and the Helpful Content system. Google Analytics 4 (GA4) Google Analytics 4 (GA4) is Google's current web analytics platform, using an event-based data model. It replaced Universal Analytics in July 2023 and provides insights into user behaviour and conversions. Google Analytics 4 (GA4) Google's current analytics platform using event-based data models, replacing Universal Analytics for SEO performance tracking. Google Business Profile A free Google tool that lets businesses manage their appearance in Google Search and Maps for local SEO. Google Core Update A Google Core Update is a broad, significant change to Google's ranking algorithms that affects search results across all topics and geographies, typically causing large ranking shifts for many websites simultaneously. Google Disavow Tool The Google Disavow Tool allows website owners to ask Google to ignore specific backlinks when assessing their site. It is used to neutralise toxic or spammy links that could trigger a Penguin penalty. Google Discover Google Discover is a personalised content feed on Android and in the Google app that shows users content based on their interests and search history — without requiring them to search for anything. Google News SEO Optimization techniques to get news articles indexed and featured in Google News and the Discover feed. Google Panda Google Panda is a major algorithm update launched in 2011 that penalises sites with low-quality, thin, or duplicate content. It was incorporated into Google's core algorithm in 2016. Google Penalty A Google penalty is a negative impact on a website's search rankings either from a manual action by a Google reviewer or from an algorithmic update targeting violations of Google's guidelines. Google Penguin Google Penguin is an algorithm update launched in 2012 that targets manipulative link building practices — specifically unnatural backlinks and keyword-stuffed anchor text. Google Sandbox Effect The observed phenomenon where new websites may take several months to rank competitively in Google, regardless of content quality. Google Search Console Google Search Console (GSC) is a free Google tool that shows how your site performs in Google Search — including impressions, clicks, rankings, crawl errors, and indexing status. Google Search Console Insights Google Search Console Insights is a simplified version of GSC designed for content creators and non-technical users, showing how content performs in search and which pieces drive the most traffic. Google Search Quality Raters Google Search Quality Raters are human evaluators contracted by Google to assess search result quality using detailed guidelines, providing feedback that helps Google improve its ranking algorithms — though raters don't directly change rankings. Grey Hat SEO SEO techniques that fall between fully compliant white hat and clearly prohibited black hat practices. Guest Posting (Guest Blogging) Guest posting is the practice of writing and publishing content on another website in exchange for a byline, brand exposure, and ideally a backlink. It's a common link building and brand authority tactic.

HTTP 302 HTTP 302 (Found) is a temporary redirect status code that sends users and bots to a different URL while keeping the original URL intact. HTTPS / SSL Certificate HTTPS (HyperText Transfer Protocol Secure) encrypts the connection between browser and server using SSL/TLS. Google has used HTTPS as a ranking signal since 2014. Heading Tags (H1–H6) Heading tags (H1 through H6) are HTML elements that define the hierarchical structure of content on a page. H1 is the main title; H2–H6 are subheadings. They are important for SEO and accessibility. Helpful Content System Google's Helpful Content System is an AI-based classifier that rewards content created primarily for people (not for search engines) and demotes sites with large amounts of "SEO-first" or AI-generated filler content. Hreflang An HTML attribute that signals to search engines which language and region a page is intended for, preventing duplicate content issues across multilingual sites. Hub and Spoke Model A content architecture where a central hub page links to multiple spoke pages on related sub-topics.

INP (Interaction to Next Paint) INP (Interaction to Next Paint) is a Core Web Vitals metric that measures a page's overall responsiveness to user interactions, replacing FID in 2024. A good INP score is under 200 milliseconds. Image Optimisation Image optimisation is the process of reducing image file size while maintaining visual quality, and adding SEO metadata (alt text, descriptive filenames) so search engines can index images and pages load faster. Image SEO Image SEO is the practice of optimising images on web pages to improve page performance and enable discovery through Google Image Search, using techniques like alt text, file names, compression, and structured data. Index Coverage The status of pages on a site as reported by Google Search Console — indexed, excluded, or errored. Indexability Indexability is the ability of a web page to be included in a search engine's index. A page can be crawlable but not indexable if it has a noindex tag, canonical pointing to another URL, or other indexation blockers. Internal Link An internal link is a hyperlink from one page to another page on the same domain. Internal links distribute PageRank, help crawlers discover content, and guide users through a site. Internal Linking Internal linking is the practice of linking between pages on the same website. It helps search engines understand site structure, distributes PageRank, and guides users to related content. Internal PageRank Distribution How link equity flows through a site's internal link structure, determining which pages receive the most authority. International SEO International SEO is the practice of optimising a website to rank in multiple countries and languages, using technical signals like hreflang, geo-targeting settings, and localised content to serve the right version to the right audience. International SEO Targeting The process of configuring a website to target multiple countries or languages in search engines simultaneously.

JavaScript SEO JavaScript SEO addresses how search engines discover, crawl, and render JavaScript-heavy websites, ensuring that content rendered via JS is accessible to crawlers and can be indexed properly.

Keyword Cannibalisation When multiple pages on the same site compete for the same keyword, splitting ranking signals and reducing overall effectiveness. Keyword Cannibalization Keyword cannibalization occurs when multiple pages on the same site target the same keyword, causing them to compete against each other and diluting ranking power instead of concentrating it. Keyword Clustering Keyword clustering is the process of grouping semantically related keywords together so they can be targeted by a single page, avoiding keyword cannibalism and ensuring content comprehensively covers a topic. Keyword Density Keyword density is the percentage of times a target keyword appears on a page relative to total word count. Overuse leads to keyword stuffing penalties; modern SEO focuses on natural usage. Keyword Difficulty Keyword difficulty is a third-party comparative estimate of ranking competition; its formula and scale vary by SEO tool. Keyword Gap Analysis Identifying keywords that competitors rank for but your site does not, revealing content opportunities. Keyword Intent Keyword intent (or search intent) classifies what a user is looking to do when they type a query: find information (informational), locate a specific website (navigational), compare before buying (commercial), or buy now (transactional). Keyword Modifiers Keyword modifiers are words added to a seed keyword to specify intent, geography, format, or qualification — such as "best", "free", "near me", "for beginners", "review", or "2025" — creating more specific long-tail keyword variations. Keyword Planner Google Keyword Planner is a free tool within Google Ads that provides search volume data, competition levels, and bid estimates for keywords — widely used for SEO research despite being designed for advertisers. Keyword Position Tracking Keyword position tracking is the ongoing monitoring of where a website ranks in search results for specific target keywords, allowing SEOs to measure progress, identify opportunities, and detect ranking drops. Keyword Research Keyword research is the process of identifying the search terms your target audience uses, analysing their search volume, competition, and intent to inform your content and SEO strategy. Keyword Research Tools Software platforms used to discover, analyse, and prioritise keyword opportunities for SEO. Keyword Stuffing Keyword stuffing is a black hat SEO tactic of loading a page with an excessive number of keywords in an attempt to manipulate search rankings, often making text unreadable. Knowledge Graph Google's Knowledge Graph is a database of billions of real-world entities and their relationships, used to power Knowledge Panels and provide direct answers in search results.

LCP – Largest Contentful Paint Largest Contentful Paint (LCP) is a Core Web Vital that measures loading performance — specifically when the largest visible element on the page finishes rendering. LLM SEO (Generative Engine Optimisation) LLM SEO (also called GEO — Generative Engine Optimisation) is the emerging practice of optimising content to be cited or recommended by AI chatbots and generative search engines like ChatGPT, Perplexity, and Google AI Overviews. LSI Keywords LSI (Latent Semantic Indexing) keywords are terms semantically related to a primary keyword. Including them helps search engines understand the full context of a page's topic, though modern NLP has made strict LSI largely obsolete. Link Building Link building is the work of earning relevant editorial links and mentions that help people discover a useful resource. Link Building Outreach Link building outreach is the process of contacting website owners, editors, and bloggers to earn backlinks — by pitching guest posts, suggesting link placements, reporting broken links, or sharing content worth linking to. Link Building Strategy A planned, systematic approach to acquiring authoritative backlinks to improve a site's domain authority and rankings. Link Equity (Link Juice) Link equity (link juice) is the value or authority passed from one page to another through hyperlinks. High-authority pages pass more link equity; links from relevant, trusted sites are most valuable. Link Profile The complete collection of backlinks pointing to a website, analysed for quality, diversity, and risk. Link Reclamation Link reclamation is the process of finding and restoring lost backlinks — such as broken links to your site, unlinked brand mentions, or links pointing to pages that no longer exist — to recover lost link equity. Link Velocity The rate at which a website acquires new backlinks over time, with unnatural spikes potentially signalling manipulation. Local Citations Local citations are online mentions of a business's name, address, and phone number (NAP) on directories, review sites, and other websites, serving as a key ranking factor for local SEO. Local Content Web content specifically created to target audiences in a particular geographic area, supporting local SEO. Local Keyword Research The process of finding search queries that include geographic modifiers or local intent relevant to a specific area. Local Pack (Map Pack) The local pack (map pack) is a Google SERP feature that shows a map with three local business listings for location-based queries, above organic results. It is driven by Google Business Profile data and local SEO signals. Local SEO Local SEO is the practice of optimising a business's online presence to rank in geographically-targeted searches — especially Google's local pack and map results for queries like "near me" or "[service] in [city]". Log File Analysis Log file analysis is the process of examining a web server's access logs to understand how search engine crawlers interact with your site — what they crawl, how often, and what errors they encounter. Long-Form Content Long-form content is any piece of content typically over 2,000 words that comprehensively covers a topic. It tends to earn more backlinks, rank for more keyword variations, and generate more shares than shorter content. Long-Tail Keyword A long-tail keyword is a specific, longer search phrase — typically 3 or more words — that has lower search volume but higher purchase intent and less competition than head terms. Long-Tail Keywords Long-tail keywords are highly specific, lower-volume search queries that typically consist of 3 or more words. They have less competition, higher conversion rates, and collectively make up the majority of all searches.

Media Query A CSS media query applies different styles based on device characteristics such as screen width, resolution, or orientation — the foundation of responsive web design. Meta Description A meta description is an HTML tag that provides a brief summary of a web page's content. While not a direct ranking factor, it appears as the snippet under the page title in search results and significantly influences CTR. Mobile SEO Mobile SEO is the practice of optimising a website for mobile devices to ensure it performs well in mobile search results. Since Google switched to mobile-first indexing, the mobile version of a site is the primary version Google evaluates. Mobile-First Indexing Mobile-first indexing means Google primarily uses the mobile version of a page for indexing and ranking. Since 2023, all new sites are indexed mobile-first by default.

NAP Consistency NAP stands for Name, Address, and Phone number. Consistent NAP data across all online directories and citations is a key local SEO ranking factor that signals business legitimacy to search engines. NLP and SEO How Natural Language Processing shapes how search engines understand content, and how SEOs can write for NLP systems. Natural Language Processing (NLP) in SEO NLP in SEO refers to Google's use of natural language processing algorithms (BERT, MUM) to understand the meaning, context, and nuance of search queries and web content — going beyond keyword matching. Negative SEO Negative SEO refers to malicious tactics used to harm a competitor's search rankings — such as building toxic backlinks to their site, scraping and duplicating their content, or launching hacking attacks. News SEO Specialized SEO practices for news publishers to maximize visibility in search and news aggregators. Niche Edit A niche edit (also called a curated link or contextual edit) is the practice of adding a backlink to an existing, already-indexed article on another site rather than creating new content — leveraging the page's existing authority and age. Nofollow Nofollow is a link attribute (rel="nofollow") that signals to search engines not to follow the link or pass link equity (PageRank) to the destination URL. noindex The noindex directive tells search engines not to include a page in their search index. Applied via a meta robots tag or HTTP header, it prevents the page from appearing in search results.

Off-Page SEO Off-page SEO refers to optimisation actions taken outside your own website that affect search rankings — primarily link building, brand mentions, social signals, and digital PR. On-Page SEO On-page SEO refers to optimisations made directly on a web page to improve its relevance and rankings — including content quality, title tags, headings, internal links, and URL structure. Organic Traffic Organic traffic refers to website visitors who arrive via unpaid search engine results. It is the primary goal of SEO — growing the volume and quality of visitors who find your site through search. Orphan Page An orphan page is a page on a website that has no internal links pointing to it, making it difficult for search engine crawlers to discover and users to navigate to. Orphan Pages Orphan pages are web pages with no internal links pointing to them from other pages on the same website, making them difficult for both users and search engine crawlers to discover. Outbound Links Hyperlinks on your page that point to external websites or domains.

PPC – Pay-Per-Click Advertising PPC (Pay-Per-Click) is a digital advertising model where advertisers pay each time someone clicks their ad. Google Ads (search ads) appear at the top of SERPs and complement organic SEO efforts. Page Experience Page Experience is a Google ranking signal cluster that evaluates how users perceive the experience of a page, including Core Web Vitals, mobile-friendliness, HTTPS, and absence of intrusive interstitials. Page Speed Page speed describes how quickly a page responds, renders useful content and becomes responsive for real users. PageRank PageRank is Google's original algorithm for measuring a page's importance based on the quantity and quality of links pointing to it. It remains a core (though non-public) ranking signal. PageRank PageRank is Google's original link analysis algorithm, which assigns a score to web pages based on the quantity and quality of links pointing to them. It remains a foundational component of Google's ranking system. Pagination SEO Pagination SEO addresses how to handle multi-page content series (page 1, 2, 3...) so search engines properly crawl, index, and attribute link equity across paginated pages without treating them as duplicate content. Passage Indexing (Passage Ranking) Passage indexing (officially "passage ranking") is a Google feature that allows specific passages within a long page to rank in search results independently — so a page can rank for a specific query even if the query only matches one small section. Passage Ranking Google's ability to rank individual passages within a long page to answer specific queries, even if the full page isn't primarily about that topic. People Also Ask (PAA) People Also Ask is a Google SERP feature showing a box of related questions and expandable answers, often appearing in the top positions and increasing brand visibility. Pillar Page A comprehensive, authoritative page that covers a broad topic and links to detailed cluster content. Podcast SEO Optimizing podcast content and show notes to rank in podcast directories and search engines. Pogo-Sticking Pogo-sticking occurs when a user clicks a search result, quickly returns to the SERP, and clicks a different result — signalling that the first page didn't satisfy their query. Position Zero The featured snippet spot that appears above the #1 organic result, offering maximum SERP visibility. Product Schema Product schema is structured data markup that tells search engines detailed information about a product page — including name, price, availability, reviews, and ratings — enabling rich snippets in search results. Progressive Web App (PWA) A web application that uses modern browser features to deliver app-like experiences, improving mobile SEO performance.

REST API A REST API (Representational State Transfer API) is an architectural style for web services that uses standard HTTP methods to enable communication between systems. RankBrain RankBrain is Google's machine learning system that helps interpret search queries and match them to the most relevant results — especially for ambiguous or never-seen-before queries. RankBrain RankBrain is Google's machine learning-based component that helps Google understand ambiguous or novel search queries by mapping them to known concepts, becoming the third-most important ranking signal. Redirect Chain A redirect chain occurs when multiple redirects link together before reaching the final destination URL, wasting crawl budget and diluting link equity. Referrer The HTTP Referrer (or Referer) header identifies the URL of the previous web page that linked to the current page being requested. Review Schema Review schema is structured data markup that allows a website to display review snippets — star ratings and review counts — directly in Google search results, improving click-through rates. Rich Snippet A rich snippet is an enhanced search result that displays additional information — star ratings, prices, images, FAQs, or other structured data — making the listing more prominent in the SERP. robots.txt robots.txt is a text file at the root of a website that instructs search engine crawlers which pages or sections to crawl or not crawl, using the Robots Exclusion Protocol.

SEM (Search Engine Marketing) SEM is the practice of gaining traffic from search engines through both paid advertising (PPC) and organic search optimisation (SEO). It is the umbrella term covering both channels. SEO (Search Engine Optimisation) SEO is the practice of improving a website's visibility in organic (unpaid) search engine results through technical, on-page, and off-page optimisation. SEO A/B Testing Controlled experiments on website elements to measure the impact on organic search traffic and rankings. SEO Audit A comprehensive review of a website's technical, on-page, and off-page SEO health to identify issues and opportunities. SEO Automation SEO automation is the use of scripts, tools, and software to automate repetitive SEO tasks such as rank tracking, crawl monitoring, reporting, and alert generation — freeing time for strategic work. SEO Competitor Research SEO competitor research is the systematic analysis of websites that compete for the same organic search rankings, to uncover their strategies for content, backlinks, keywords, and technical setup, and to find gaps your site can exploit. SEO Content Brief An SEO content brief is a structured document that guides writers on how to create content that will rank — including target keywords, required headings, word count, search intent, competitors to outperform, and key topics to cover. SEO Content Calendar A planning document that schedules content creation and publication aligned with SEO goals and seasonal search trends. SEO Content Types Different content types — blog posts, landing pages, product pages, comparison pages, and tools — serve different search intents and SEO goals. Choosing the right format for each keyword is essential for ranking success. SEO Copywriting SEO copywriting is the practice of writing content that satisfies both search engine ranking requirements (keyword relevance, search intent alignment) and user needs (clarity, engagement, persuasion). SEO Forecasting SEO forecasting is the process of predicting future organic traffic, rankings, and revenue from SEO investments using historical data, keyword search volumes, and conversion rates. SEO KPIs SEO KPIs (Key Performance Indicators) are measurable metrics used to evaluate the success of SEO efforts — including organic traffic, keyword rankings, conversions, Core Web Vitals, and backlink growth. SEO KPIs Key Performance Indicators used to measure the success of an SEO strategy against defined business objectives. SEO Mindset The strategic thinking framework that guides effective SEO decision-making, prioritising user value and long-term growth. SEO Myths Commonly held misconceptions about how search engine optimisation works that can lead to wasted effort or penalties. SEO Penalty Recovery SEO penalty recovery is the process of diagnosing and fixing the cause of a traffic drop or ranking loss from a Google manual action or algorithm update, then rebuilding organic visibility. SEO Quick Wins SEO quick wins are optimisation improvements that can be implemented quickly and are likely to produce a noticeable improvement in rankings or traffic within weeks, without requiring months of content creation or link building. SEO ROI SEO ROI (Return on Investment) measures the financial return from SEO efforts relative to the cost of those efforts. Calculating it helps justify SEO budgets and prioritise the highest-value activities. SEO Reporting The process of tracking, analysing, and communicating SEO performance data to stakeholders. SEO Site Migration An SEO site migration is any significant change to a website's domain, URL structure, platform, or protocol that can impact organic search visibility. Poor migrations can cause massive, long-lasting ranking drops. SEO Site Structure The logical organisation of a website's pages and URL hierarchy to maximise crawlability and topical authority. SEO Split Testing SEO split testing (A/B testing for SEO) is the practice of making controlled changes to a subset of pages and measuring whether those changes improve rankings, traffic, or click-through rates compared to unchanged control pages. SEO Strategy An SEO strategy is a comprehensive, prioritised plan for improving organic search visibility that aligns with business goals, covering keyword targeting, content, technical optimisation, and link building over a defined time horizon. SEO Tools SEO tools are software platforms that assist with keyword research, rank tracking, backlink analysis, technical audits, and competitor research — helping SEO professionals make data-driven decisions. SEO Tools Overview A survey of the major software categories used by SEO professionals for research, auditing, tracking, and reporting. SEO Workflow A structured, repeatable process for planning, executing, and measuring SEO tasks efficiently. SEO for Startups SEO for startups focuses on building organic search visibility with limited resources by targeting low-competition keywords, creating high-quality content, and building early domain authority. SERP SERP stands for Search Engine Results Page — the page shown by a search engine after a query, containing organic results, ads, featured snippets, and other SERP features. SERP Click Distribution The percentage of clicks each organic position receives on a search results page. SERP Features SERP features are non-standard results that appear in Google's search results beyond the traditional blue links — including featured snippets, knowledge panels, image carousels, and local packs. SERP Features Overview SERP features are non-standard elements in Google's search results beyond the traditional blue links — including featured snippets, knowledge panels, image packs, video carousels, and more, each with specific optimisation opportunities. SERP Real Estate SERP real estate refers to the total amount of visible space a website occupies on a search results page — through organic listings, featured snippets, sitelinks, knowledge panels, and other SERP features. SERP Volatility SERP volatility measures how much search rankings fluctuate on a given day or period. High volatility indicates Google is testing or rolling out algorithm changes; low volatility suggests stable rankings. SaaS SEO SEO strategies tailored to software-as-a-service companies, focused on capturing demand at every stage of the buyer journey. Schema Markup Schema markup (Schema.org vocabulary) is code added to HTML that labels content so search engines can understand what it means — enabling rich results like star ratings, FAQs, recipes, and events in the SERP. Search Algorithm A search algorithm is the set of rules and processes a search engine uses to retrieve and rank web pages in response to a query. Google's algorithm uses hundreds of ranking signals. Search Intent (User Intent) Search intent is the underlying goal behind a search query — what the user actually wants to find or do. Matching content to intent is the single most important on-page SEO factor. Search Intent Alignment Ensuring your page content and format precisely match what users expect to find when they search for a given query. Search Volume Search volume is the average number of times a specific keyword is searched per month in a given search engine and country. It is a primary metric in keyword research for estimating potential traffic from a keyword. Semantic SEO Semantic SEO is the practice of optimising content for meaning and context rather than just keywords, using related entities, synonyms, and comprehensive topic coverage to match how Google's AI understands language. Server-Side Rendering (SSR) A technique where HTML is generated on the server and sent to the browser, making content immediately crawlable. Session ID A session ID is a unique identifier assigned to a user's browsing session, often appended to URLs, which can cause duplicate content problems for SEO. Share of Voice (SOV) Share of voice in SEO measures what percentage of all clicks for a set of target keywords goes to your website versus competitors, showing your relative market presence in organic search. Site Architecture Site architecture refers to how a website's pages are structured, organised, and linked together. Good architecture helps search engines crawl the site efficiently and users navigate it intuitively. Site Speed Site speed refers to how quickly web pages load for users. It is a confirmed Google ranking factor for both desktop and mobile search, and directly impacts user experience, bounce rates, and conversion rates. Sitemap A sitemap is a file (usually XML) that lists a website's pages to help search engines discover and crawl them. Submit it to Google via Search Console. Skyscraper Technique The Skyscraper Technique is a link building strategy by Brian Dean (Backlinko): find top-linked content in your niche, create a superior version, then outreach to the same sites that linked to the original. Social Proof in SEO Social proof in SEO refers to reviews, testimonials, ratings, and user-generated content that build trust with users and can influence click-through rates, dwell time, and conversions — indirectly supporting search performance. Social Signals Social signals are engagement metrics from social media platforms (shares, likes, comments) that some SEOs believe correlate with search rankings, though Google has stated they are not direct ranking factors. Structured Data Structured data is code added to web pages (typically JSON-LD) that helps search engines understand the content and can enable rich results like star ratings, FAQs, and prices in the SERP. Structured Snippet A type of Google Ads extension that highlights specific aspects of products or services — also refers to the organic SERP feature showing categorised lists.

TTFB – Time to First Byte Time to First Byte (TTFB) measures the time between a browser requesting a page and receiving the first byte of the server response — a key indicator of server performance. Technical SEO Technical SEO refers to optimisations that make a website easier for search engine crawlers to access, crawl, interpret, and index — covering speed, mobile-friendliness, structured data, and crawlability. Thin Affiliate Content Thin affiliate content refers to affiliate websites that add little or no original value — typically just aggregating product information from retailers with copied descriptions — which Google actively penalises. Thin Content Thin content refers to web pages with little or no added value — low word count, duplicate text, auto-generated pages, or doorway pages. Google penalises thin content via the Panda algorithm. Time to First Byte (TTFB) The time between a browser requesting a page and receiving the first byte of data from the server. Title Tag The title tag is an HTML element that specifies the title of a web page. It appears in browser tabs, search results, and social shares — and is one of the most important on-page SEO elements. Topic Cluster A topic cluster is a content strategy model where a single pillar page about a broad topic links to and receives links from multiple supporting cluster pages, each covering a specific subtopic in depth. Topical Authority Topical authority is the perceived expertise of a website on a specific subject, built by comprehensively covering all aspects of a topic. Sites with high topical authority rank more easily for related keywords. Topical Map A topical map is a strategic content planning document that outlines all the subtopics, queries, and content pieces needed to achieve comprehensive topical authority in a niche. Toxic Backlinks Toxic backlinks are low-quality or manipulative links that can harm a website's search rankings. They typically come from spammy directories, link farms, hacked sites, or irrelevant sites with no real traffic. Types of Backlinks Backlinks vary in quality and value based on whether they are followed or nofollowed, editorial or paid, from relevant or irrelevant sources, and from high-authority or low-authority domains.

URL Parameters URL parameters are variables added to a URL (after a "?") that modify page content without creating a new page, such as tracking parameters, sorting options, or filters — often causing duplicate content issues in SEO. URL Slug A URL slug is the part of a URL that identifies a specific page in a human-readable format — typically a short, descriptive, hyphenated phrase after the domain and subdirectory. URL Structure URL structure refers to how web addresses are formatted and organised. A clean, descriptive URL structure helps search engines understand page content and can slightly improve click-through rates in search results. User Experience (UX) User experience (UX) is how a person feels when interacting with a website — covering ease of navigation, visual design, speed, and content quality. UX is an increasingly important Google ranking signal.

Video SEO Optimizing video content to rank in search engines and video platforms like YouTube. Voice Search SEO Voice search SEO optimises content for spoken queries made via voice assistants (Siri, Google Assistant, Alexa). Voice queries are longer, more conversational, and more often local and question-based. Voice Search SEO Optimising content for spoken queries made through virtual assistants like Google Assistant, Siri, and Alexa.

Web Directory A web directory is a manually curated website that organizes links to other websites by category. Historically important for SEO, directories have declined in relevance since algorithmic search engines matured. White Hat SEO SEO practices that comply fully with search engine guidelines and focus on long-term, sustainable growth.

XML Sitemap An XML sitemap is a file that lists all the important URLs on a website, helping search engines discover and prioritise content for crawling and indexing.

Zero-Click Search Search queries where the user gets the answer directly on the SERP without clicking any result.