A comprehensive, regularly updated dictionary of 150+ SEO terms — from foundational concepts like backlinks and crawling to modern AI-search topics like generative engine optimization.
This glossary covers 150+ terms from across the modern SEO discipline — on-page optimization, technical SEO, local SEO, content strategy, analytics, algorithm updates, AI search, and foundational web concepts.
Each entry is written by senior SEO strategists and includes a definition, deeper context, best practices, common mistakes, and links to related terms. We update entries as Google's standards and the broader search landscape evolve. Our recent seo glossary engagements informed every recommendation on this page.
- **Title Tag** — The HTML <title> element that defines a page's title for browsers, search engines, and social shares. - **Meta Description** — A 150–160 character HTML attribute summarizing a page's content, displayed beneath the title in SERPs. - **H1 Tag** — The primary heading of a web page, defined with <h1> HTML tags. - **Heading Hierarchy** — The structured use of H1–H6 tags to convey content organization to readers and crawlers. - **Alt Text** — Text that describes an image, used by screen readers and search engines when an image fails to load. - **Canonical Tag** — An HTML element (rel=canonical) that signals the preferred URL when multiple URLs serve similar content. - **Internal Linking** — Links from one page on a domain to another page on the same domain. - **Anchor Text** — The clickable text portion of a hyperlink. - **URL Structure** — The format and organization of URLs across a website. - **Schema Markup** — Structured data vocabulary (schema.org) that helps search engines understand page content. - **JSON-LD** — JavaScript Object Notation for Linked Data — Google's preferred format for schema markup. - **Structured Data** — Standardized format for marking up content so search engines can understand its meaning. - **Rich Result** — Enhanced search result with extra visual elements like ratings, prices, or FAQ accordions. - **Breadcrumb Navigation** — Navigation showing a page's position in site hierarchy (e.g., Home > Services > SEO). - **Keyword Density** — The percentage of times a keyword appears in content relative to total word count. - **Keyword Stuffing** — The practice of overloading content with repeated keywords to manipulate rankings. - **LSI Keywords** — Latent Semantic Indexing keywords — semantically related terms that reinforce a page's topic. - **Content Pruning** — The deliberate removal or consolidation of low-quality, outdated, or duplicate pages. If you're researching seo glossary, this page covers what actually moves the needle in 2026.
- **Backlink** — An incoming link from another website to yours. - **Link Building** — The process of acquiring backlinks from other websites to improve search rankings. - **Do-Follow Link** — A standard hyperlink that passes link equity (PageRank) to the linked page. - **No-Follow Link** — A link with rel=nofollow attribute — historically passed no PageRank. - **UGC Link** — A link in user-generated content, marked with rel=ugc. - **Sponsored Link** — A paid or compensated link, marked with rel=sponsored. - **Domain Authority** — Moz's proprietary score (0–100) predicting a domain's ranking strength. - **Domain Rating** — Ahrefs' equivalent of Domain Authority — a 0–100 score of backlink profile strength. - **PageRank** — Google's original algorithm for ranking pages based on the quantity and quality of inbound links. - **Link Equity** — The SEO value passed from one page to another via hyperlinks (sometimes called 'link juice'). - **Guest Post** — A blog article published on another website to earn a backlink and exposure. - **Digital PR** — Public-relations strategy focused on earning editorial coverage and links from online publications. - **Broken Link Building** — A tactic of finding broken outbound links on other sites and offering replacement links to your content. - **Skyscraper Technique** — Brian Dean's link-building method — find ranking content, build something better, outreach to existing linkers. - **Outreach** — The process of contacting other site owners or journalists to request links, mentions, or coverage. - **Backlink Profile** — The complete set of inbound links pointing to a website. When you evaluate seo glossary, prioritize senior expertise over agency size.
- **Crawling** — The process by which search engine bots discover web pages by following links. - **Indexation** — The process of adding pages to a search engine's database after crawling. - **robots.txt** — A text file at site root that tells crawlers which URLs they can and cannot access. - **XML Sitemap** — A file listing all important URLs on a site, submitted to search engines via Search Console. - **301 Redirect** — A permanent server-side redirect from one URL to another. - **302 Redirect** — A temporary server-side redirect from one URL to another. - **Redirect Chain** — A sequence of multiple redirects between the original URL and the final destination. - **HTTP Status Code** — Three-digit codes returned by web servers indicating request status (200 OK, 404 Not Found, etc). - **404 Page** — An HTTP response indicating the requested URL does not exist. - **Soft 404** — A page that returns 200 OK but has minimal content or implies a 'not found' state. - **Noindex Tag** — A meta tag (or X-Robots-Tag header) telling search engines not to index a page. - **Core Web Vitals** — Google's set of UX metrics measuring real-world page performance: LCP, INP, CLS. - **Largest Contentful Paint (LCP)** — The time it takes for the largest content element (usually a hero image) to render. - **Interaction to Next Paint (INP)** — Measures responsiveness — the time from user interaction to the next visual update. - **Cumulative Layout Shift (CLS)** — Measures visual stability — how much content shifts unexpectedly during page load. - **Page Speed** — How quickly a page loads — measured by metrics including LCP, FCP, TTI, and TTFB. - **Time to First Byte (TTFB)** — The time between a request being made and the first byte of response being received. - **Hreflang** — An HTML attribute (or HTTP header) signaling the language and region of a page to search engines. - **JavaScript SEO** — The practice of optimizing JS-heavy sites so search engines can crawl and index them. - **Mobile-First Indexing** — Google's policy of using the mobile version of a page for ranking and indexation. - **HTTPS** — Hypertext Transfer Protocol Secure — the encrypted version of HTTP. - **Crawl Budget** — The number of URLs Googlebot will crawl on a site within a given timeframe. Want to discuss seo glossary? Our discovery call is free and consultative.
- **Local SEO** — The practice of optimizing a business's online presence to rank for location-based searches. - **Google Business Profile** — Google's free business listing service (formerly Google My Business). - **Map Pack** — The block of three local businesses displayed at the top of local search results, with a Google Map. - **NAP** — Name, Address, Phone — the three core data points for local business citations. - **Citation** — Any online mention of a business's NAP information, with or without a link. - **Geo-Targeting** — The practice of delivering content or ads based on a user's geographic location. - **Service-Area Business** — A GBP listing type for businesses that travel to customers (no public storefront). - **Local Pack** — Synonym for Map Pack — the local business block in search results. - **Google Reviews** — Customer reviews left on a Google Business Profile. - **Review Velocity** — The rate at which a business accumulates new reviews over time. - **LocalBusiness Schema** — Schema.org markup specifically for local businesses, with subtypes for industries. - **Geo-Grid Rank Tracking** — A method of tracking local rankings across multiple physical locations in a service area. - **Directory Listing** — A business listing on an online directory (Yelp, Yellow Pages, industry directories). - **Proximity (Local SEO)** — The distance between a searcher and a business — the #1 Map Pack ranking factor. - **Reputation Management** — The practice of monitoring and influencing what's said about a brand online. Throughout our work on seo glossary, we cite primary sources and current data.
- **Search Intent** — The underlying goal a user has when typing a query into a search engine. - **Keyword Research** — The process of identifying valuable search terms that potential customers use. - **Long-Tail Keyword** — Specific, multi-word search queries with lower search volume but higher intent. - **Topic Cluster** — A group of related pages organized around a central pillar page. - **Pillar Page** — A comprehensive resource page targeting a broad topic, supported by cluster pages. - **Topical Authority** — A site's perceived expertise on a particular subject, built through depth of relevant content. - **E-E-A-T** — Experience, Expertise, Authoritativeness, Trustworthiness — Google's content quality framework. - **YMYL** — Your Money, Your Life — content categories where Google applies stricter quality standards. - **Content Gap** — A topic competitors rank for that your site doesn't cover. - **Thin Content** — Pages with little or no substantive value to users. - **Duplicate Content** — Substantial content that appears in multiple places on the web (within or across domains). - **Content Quality** — The overall depth, accuracy, originality, and usefulness of web content. - **Keyword Cannibalization** — When multiple pages on the same site compete for the same keyword. - **Content Strategy** — A documented plan for creating, publishing, and governing content to achieve business goals. - **Featured Snippet** — A direct-answer block at the top of search results, pulled from a ranking page. If you're researching seo glossary, this page covers what actually moves the needle in 2026.
- **Click-Through Rate (CTR)** — The percentage of impressions that result in a click. - **Bounce Rate** — The percentage of visitors who leave a site after viewing only one page. - **Dwell Time** — The time between a user clicking a search result and returning to the SERP. - **Engagement Rate** — GA4's metric for the percentage of sessions that were 'engaged' (10+ seconds, conversion, or 2+ pageviews). - **Impression** — A single appearance of a URL in search results, regardless of whether it was clicked. - **Google Analytics 4 (GA4)** — Google's current analytics platform, replacing Universal Analytics in 2023. - **Google Search Console (GSC)** — Google's free tool for monitoring a site's presence in search results. - **KPI** — Key Performance Indicator — a measurable value tied to business goals. - **Conversion Rate** — The percentage of visitors who complete a desired action (purchase, lead, signup). - **Conversion Rate Optimization (CRO)** — The systematic process of increasing the percentage of visitors who convert. - **A/B Testing** — Comparing two versions of a page or element to determine which performs better. - **Rank Tracking** — Monitoring keyword positions in search results over time. Senior strategists own every seo glossary engagement here — never juniors learning on your account.
- **Google Algorithm** — The system Google uses to rank web pages — comprised of hundreds of signals. - **Google Core Update** — Periodic broad changes to Google's ranking algorithm, typically released several times per year. - **Helpful Content Update** — A Google system designed to reward content created for people, not search engines. - **Panda Update** — A 2011 algorithm update targeting low-quality and thin content. - **Penguin Update** — A 2012 algorithm update targeting manipulative link-building tactics. - **RankBrain** — Google's machine-learning algorithm that helps interpret novel queries. - **BERT** — Bidirectional Encoder Representations from Transformers — Google's NLP model for understanding query context. - **MUM** — Multitask Unified Model — Google's AI model 1000× more powerful than BERT. - **Manual Action** — A penalty applied by a human Google reviewer, surfaced in Search Console. - **Disavow Tool** — A Search Console tool for telling Google to ignore specific backlinks. Our team's perspective on seo glossary comes from active client work, not theory.
- **AI Overview** — Google's AI-generated summary that appears at the top of some search results. - **Generative Engine Optimization (GEO)** — Optimizing content to appear in AI-generated answers (ChatGPT, Perplexity, Google AI Overviews). - **llms.txt** — A proposed standard file (/llms.txt) that helps LLMs understand a site's content. - **AI-Generated Content** — Content created primarily by large language models (GPT, Claude, Gemini). - **AI Search** — Search experiences powered by AI models (Google AI Overviews, ChatGPT Search, Perplexity). - **Perplexity** — An AI-powered search engine that provides cited, generative answers. - **Speakable Schema** — Schema.org property indicating content sections suitable for voice-assistant readout. - **Voice Search** — Search queries spoken to a voice assistant (Google Assistant, Siri, Alexa). Considering seo glossary? Book a no-pressure strategy call to compare options.
- **White Hat SEO** — SEO practices that comply with search engine guidelines and prioritize user value. - **Black Hat SEO** — SEO tactics that violate search engine guidelines for short-term ranking gains. - **Gray Hat SEO** — Tactics in the ambiguous zone between white hat and black hat. - **Google Webmaster Guidelines** — Google's published rules for how websites should be built and promoted. - **Ranking** — The position a page occupies in search results for a given query. - **SERP** — Search Engine Results Page — the page returned in response to a query. - **Googlebot** — Google's web crawler, responsible for discovering and fetching web pages. - **User Experience (UX)** — The overall experience a user has interacting with a website. - **Responsive Design** — Web design approach that adapts layout to screen size using CSS media queries. - **Web Accessibility** — Designing websites usable by people with disabilities (vision, motor, cognitive). - **WCAG** — Web Content Accessibility Guidelines — the international standard for web accessibility. - **Semantic HTML** — HTML markup that conveys meaning, not just presentation (article, nav, aside, header). - **SSL/TLS Certificate** — Cryptographic protocol enabling HTTPS — the encryption layer for web traffic. - **Site Architecture** — The structural organization of pages and content within a website. - **Subdomain** — A separate domain prefix (blog.example.com) — historically treated by Google as a separate site. - **Subdirectory** — A folder under the main domain (example.com/blog/) — preferred over subdomains for SEO. - **Branded Search** — Searches that include a brand name (e.g., 'Ottawa SEO Inc.'). - **Non-Branded Search** — Searches that don't include a brand name — typically discovery queries. - **Knowledge Panel** — A box on Google SERPs displaying entity information (people, companies, places, things). - **Knowledge Graph** — Google's database of entities and their relationships, powering rich search features. - **Entity SEO** — Optimizing for how search engines understand entities (people, places, things, concepts). - **Server-Side Rendering (SSR)** — Rendering web pages on the server and sending fully-formed HTML to the browser. - **Static Site Generation (SSG)** — Pre-rendering all pages at build time into static HTML files. - **Rendering** — The process of converting code into the final visual web page. - **Content Delivery Network (CDN)** — A geographically-distributed network of servers that caches and serves web content. - **Caching** — Storing copies of web resources for faster subsequent delivery. - **Image SEO** — Optimizing images for both search engine crawlers and page performance. - **Lazy Loading** — Deferring image and iframe loading until they're about to enter the viewport. - **Image Sitemap** — An XML sitemap variant listing image URLs for Google Image Search indexation. - **Favicon** — The small icon displayed in browser tabs, bookmarks, and modern SERPs. - **Open Graph** — Facebook's protocol for controlling how URLs appear when shared on social media. - **Twitter Card** — Twitter's metadata protocol for rich link previews on the platform. - **Permalink** — A permanent, fixed URL that points to a specific resource and doesn't change over time. - **Trailing Slash** — The forward slash at the end of URLs (example.com/page/ vs example.com/page). Considering seo glossary? Book a no-pressure strategy call to compare options. Our recent seo glossary engagements informed every recommendation on this page.
We review and update entries quarterly, with immediate revisions when Google announces major algorithm changes.
Yes — email suggestions to info@ottawaseo.com and we'll consider them in the next update cycle.
Yes. Each entry starts with a plain-language definition, then deepens for practitioners.
The term originated in the technical-SEO community as Google's ranking algorithms grew more sophisticated in the 2010s. It's now standard vocabulary in agency briefs, audit reports, and Search Console documentation. Knowing it well helps you evaluate vendor claims.
If your business depends on organic traffic from Google, then yes — at least at the awareness level. The implementation usually falls to your developer or SEO partner; the strategic decisions are yours. Our job is to translate technical concepts into business terms.