Last updated: September 2026.
An SEO glossary is a reference list of search engine optimization terms and what they actually mean. This one covers 140+ terms across technical SEO, link building, content, local SEO, analytics, and AI search, including the AI citation and GEO terms most glossaries still leave out.
Quick Takeaways
- SEO terminology now spans two worlds: traditional search engine ranking and AI-generated answers on tools like ChatGPT and Perplexity. Most glossaries online still only cover the first one.
- Use the category table below to jump straight to the section you need instead of scrolling the whole page.
- Terms are grouped by category, not strict alphabetical order, so related concepts sit next to each other.
Jump to a Category
| Category | Covers |
| Core SEO Fundamentals | SEO basics, keywords, search intent, algorithm concepts |
| Technical SEO | Crawling, indexing, redirects, Core Web Vitals, schema |
| Link Building & Authority | Backlinks, anchor text, link types, link building tactics |
| Content & On-Page SEO | Title tags, meta descriptions, content structure |
| Local SEO | Google Business Profile, citations, map pack |
| AI Search & GEO | AI Overviews, LLM citation, AI crawlers, generative engine optimization |
| Analytics & Reporting | GA4, Search Console, CTR, conversion tracking |
Core SEO Fundamentals
SEO (Search Engine Optimization): The practice of improving a website so it ranks higher in unpaid, organic search results.
Search Engine: A program like Google or Bing that crawls, indexes, and ranks web pages to answer a search query.
SERP (Search Engine Results Page): The page a search engine shows after someone runs a search, including organic listings, ads, and features like AI Overviews or the local pack.
Organic Search: Unpaid search results that rank because a search engine judged them relevant, not because someone paid for placement.
Keyword: A word or phrase a person types or speaks into a search engine, and the term SEO strategy is built around targeting.
Keyword Research: The process of finding which terms people actually search for, along with their volume, difficulty, and intent, before deciding what to target.
Search Intent: The underlying reason behind a search, usually grouped as informational, navigational, commercial, or transactional.
Search Volume: The average number of times a keyword is searched per month.
Keyword Difficulty (KD): A score, usually 0 to 100, estimating how hard it would be to rank in the top organic results for a given keyword.
Long-Tail Keyword: A longer, more specific search phrase that usually has lower volume but higher intent and less competition.
Short-Tail Keyword: A broad, one or two-word search term with high volume and high competition.
Head Term: The core, high-volume keyword a topic or page is built around.
Primary Keyword: The single main keyword a page is optimized to rank for.
Secondary Keyword: A related term closely tied to the primary keyword, often used to add topical depth to a page.
Branded Keyword: A search query that includes a specific company or product name.
Non-Branded Keyword: A search query with no brand name attached, typically used to attract new customers who don’t know the business yet.
White Hat SEO: SEO tactics that follow search engine guidelines and focus on genuinely improving the site for users.
Black Hat SEO: Tactics that violate search engine guidelines to manipulate rankings, such as keyword stuffing or buying links at scale.
Grey Hat SEO: Tactics that sit in between, technically not against the rules but pushing the spirit of them.
Algorithm: The set of rules and calculations a search engine uses to decide which pages to show and in what order.
Algorithm Update: A change to how a search engine’s algorithm evaluates and ranks pages.
Core Update: A broad, non-targeted algorithm update Google rolls out several times a year that can shift rankings across many sites at once.
SEO Audit: A structured review of a website’s technical health, content, and backlink profile to find what’s holding rankings back.
Domain Authority (DA): A third-party metric (from Moz) estimating how likely a domain is to rank, on a 0 to 100 scale.
Domain Rating (DR): Ahrefs’ equivalent metric, estimating the strength of a website’s backlink profile on a 0 to 100 scale.
E-E-A-T: Experience, Expertise, Authoritativeness, and Trustworthiness, the quality signals Google’s human raters use to judge content, especially on YMYL topics.
YMYL (Your Money or Your Life): Content covering topics that could affect someone’s health, finances, or safety, and which Google holds to a higher quality bar.
Topical Authority: How deep and consistent a site’s coverage of a subject is, built through related content and clear internal linking, not a single page alone.
Entity: A specific, well-defined person, place, organization, or concept that a search engine can recognize and connect to related facts.
Entity-Based SEO: An approach centered on how search engines and AI systems understand entities and their relationships, rather than keywords alone.
Knowledge Graph: Google’s database of entities and the relationships between them, used to power knowledge panels and some AI answers.
Search Engine Marketing (SEM): A term some use for paid search advertising specifically, while others use it to mean SEO and paid search combined.
PPC (Pay-Per-Click): Paid advertising where the advertiser is charged each time someone clicks the ad.
Organic Traffic: Website visits that come from unpaid search results.
Technical SEO
Crawling: The process a search engine bot uses to discover and read pages across the web.
Crawler: The bot (such as Googlebot) that crawls the web to find and read pages.
Crawl Budget: The number of pages a search engine is willing to crawl on a given site within a given time period, mostly relevant for large websites.
Indexing: The process of storing a crawled page in a search engine’s database so it can appear in search results.
Indexability: Whether a page can actually be added to a search engine’s index, based on technical signals like noindex tags or robots.txt rules.
Googlebot: Google’s own web crawler.
Robots.txt: A text file at a site’s root that tells crawlers which parts of the site they can and can’t access.
Noindex Tag: An HTML directive telling search engines not to include a specific page in their index.
Canonical Tag: An HTML tag that tells search engines which version of a duplicate or near-duplicate page should be treated as the main one.
Canonical URL: The URL a canonical tag points to as the preferred version of a page.
Duplicate Content: The same or very similar content appearing on more than one URL, which can confuse search engines about which version to rank.
301 Redirect: A permanent redirect that sends users and search engines from an old URL to a new one, passing most of the original page’s ranking value along.
302 Redirect: A temporary redirect, used when a page will return to its original URL later.
404 Error: The status code shown when a requested page doesn’t exist.
XML Sitemap: A file listing a site’s important URLs, submitted to help search engines discover pages more efficiently.
Core Web Vitals: Google’s page experience metrics measuring loading speed, interactivity, and visual stability.
Largest Contentful Paint (LCP): A Core Web Vitals metric measuring how long it takes for the largest visible element on a page to load.
Interaction to Next Paint (INP): A Core Web Vitals metric measuring how quickly a page responds to a user’s click or tap.
Cumulative Layout Shift (CLS): A Core Web Vitals metric measuring how much a page’s layout unexpectedly shifts while loading.
Page Speed: How quickly a webpage loads, which affects both user experience and, to a lesser degree, rankings.
Mobile-First Indexing: Google’s practice of using the mobile version of a page as the primary version for indexing and ranking.
JavaScript SEO: The technical work of making JavaScript-heavy sites crawlable and indexable, since search engines can struggle to render some JS content.
HTTPS: The secure, encrypted version of HTTP, and a minor Google ranking signal.
Structured Data: Code added to a page, usually in JSON-LD format, that describes its content in a way search engines and AI systems can parse directly.
Schema Markup: The specific vocabulary (from schema.org) used to write structured data, covering things like articles, FAQs, products, and local businesses.
Link Building & Authority
Backlink: A link from one website pointing to a page on another website, also called an inbound link.
Inbound Link: See Backlink.
Outbound Link: A link from your page pointing out to a different website.
Internal Link: A link connecting one page to another page on the same website.
Anchor Text: The clickable, visible text of a hyperlink, which gives both users and search engines context about the linked page.
Dofollow Link: A standard link with no attribute blocking it from passing ranking value to the linked page.
Nofollow Link: A link with a rel=”nofollow” attribute, signaling that the linking site isn’t vouching for the destination page.
Link Building: The ongoing process of earning links from other websites to build a site’s authority and visibility.
Link Equity: The ranking value a link passes from the linking page to the linked page, sometimes called link juice.
Editorial Link: A link placed by an author or publisher on its own initiative, not requested or paid for.
Guest Post: An article written for and published on another website, usually including a link back to the author’s own site.
Guest Blogging: The broader practice of contributing guest posts as a link building and audience-building tactic.
Link Farm: A group of websites created solely to link to each other and manipulate rankings, considered a black hat tactic.
Private Blog Network (PBN): A network of separately owned-looking websites built specifically to link to a target site and pass ranking value, against Google’s guidelines.
Disavow: A tool that tells Google to ignore specific backlinks, typically used to clean up a spammy or manipulated link profile.
Link Velocity: The rate at which a website gains (or loses) backlinks over time.
Broken Link: A link pointing to a page that no longer exists or returns an error.
Reciprocal Link: A link exchange where two sites agree to link to each other.
Co-citation: When two websites or brands are mentioned together by a third-party source, even without a direct link between them, which search engines and AI systems can use as a relevance signal.
Content & On-Page SEO
On-Page SEO: Optimization work done directly on a webpage, including content, title tags, headers, and internal links.
Off-Page SEO: Optimization work happening outside the website itself, primarily link building and brand mentions.
Title Tag: The HTML element defining a page’s title, typically shown as the clickable headline in search results.
Meta Description: An HTML snippet summarizing a page’s content, often shown as the description text under a search result.
H1 Tag: The main heading of a page, usually stating its core topic.
Header Tags: HTML tags (H1 through H6) used to structure content into headings and subheadings by importance.
Alt Text: A written description of an image, used by screen readers and search engines since they can’t “see” the image itself.
Keyword Stuffing: Repeating a keyword unnaturally throughout content in an attempt to manipulate rankings, which search engines now penalize.
Keyword Cannibalization: When multiple pages on the same site target the same keyword and end up competing with each other in search results.
Thin Content: Content that offers little real value or depth, often too short or generic to satisfy search intent.
Evergreen Content: Content that stays relevant and useful well beyond its publish date.
Content Gap Analysis: Comparing a site’s content against competitors’ to find topics, subtopics, or keywords that are missing.
Pillar Page: A comprehensive page covering a broad topic, usually linked to a cluster of more specific supporting pages.
Topic Cluster: A group of related pages, all linking back to a central pillar page, that together build topical authority.
Featured Snippet: A highlighted answer box Google sometimes shows above the standard organic results for a query.
People Also Ask: A SERP feature showing related questions that expand as a user clicks through them.
Rich Snippet: A search result enhanced with extra visual information, like star ratings or prices, generated from structured data.
URL Slug: The part of a URL that comes after the domain name, ideally short and descriptive of the page’s content.
Content Freshness: How recently a piece of content has been meaningfully updated, which can matter for queries where up-to-date information is expected.
Local SEO
Local SEO: The practice of optimizing a business’s online presence to rank in local, location-based search results.
Google Business Profile (GBP): A free Google listing that shows a business’s information in Google Maps and local search results.
NAP: A business’s Name, Address, and Phone number, expected to be consistent across the web for strong local SEO.
Local Citation: Any online mention of a business’s NAP, typically found in directories, even without a link back to the site.
Local Pack: The map-based set of (usually three) local business listings shown for a local search query.
Map Pack: Another name for the local pack.
Local Search Marketing: The broader set of tactics used to improve visibility for a business that serves customers in a specific area.
Review Signals: The volume, recency, and rating of customer reviews, which influence both local rankings and buyer decisions.
Geo-Targeting: Tailoring content, ads, or rankings toward a specific geographic location.
Service Area Business: A business that serves customers at their location rather than a fixed storefront, requiring a different Google Business Profile setup.
Proximity Signal: How close a searcher is to a business location, which strongly influences local pack rankings.
Local Landing Page: A page built specifically to target a business’s presence in one particular city or service area.
Local Link Building: Earning backlinks from locally relevant sources, like community organizations, local news, or local directories.
Local Business Schema: Structured data specifically describing a local business’s name, address, hours, and other details for search engines.
If you’re comparing agencies to handle any of this, our breakdown of the 10 best local SEO agencies in 2026 covers how ten of them stack up.
AI Search & GEO
Most SEO glossaries stop at traditional ranking terms. This section covers the vocabulary that’s become just as relevant since AI-generated answers started appearing directly in search results.
Generative Engine Optimization (GEO): The practice of structuring and writing content so AI systems like ChatGPT, Perplexity, and Google AI Overviews can understand, trust, and cite it in their generated answers.
Answer Engine Optimization (AEO): A closely related term to GEO, focused specifically on optimizing content to be pulled into direct AI-generated answers rather than traditional ranked results.
AI Overview: Google’s AI-generated summary that can appear above standard organic results for certain search queries.
AI Mode: Google’s more conversational, multi-step AI search experience, built for exploratory and comparison-heavy queries.
Large Language Model (LLM): The AI system (like GPT or Gemini) trained on large amounts of text that powers tools like ChatGPT and generates AI search answers.
AI Citation: A mention or reference to a brand, article, or data point inside an AI-generated answer, functioning similarly to how a backlink or reference works in traditional search.
LLM Citation: Another term for AI citation, specifically referring to being referenced by a large language model’s output.
AI Crawler: A bot that crawls the web specifically to gather training or retrieval data for an AI system, such as GPTBot, PerplexityBot, or ClaudeBot.
GPTBot: OpenAI’s web crawler, used to gather content that can inform ChatGPT’s responses.
PerplexityBot: Perplexity’s web crawler, used to retrieve and cite content in its AI-generated answers.
ClaudeBot: Anthropic’s web crawler, used in a similar way for Claude’s AI-generated responses.
Google-Extended: A control that lets site owners choose whether their content can be used to train Google’s AI models, separate from standard Googlebot crawling.
Zero-Click Search: A search where the user gets their answer directly from the results page, whether from a featured snippet, AI Overview, or knowledge panel, without clicking through to a website.
AI Share of Voice: How often a brand appears in AI-generated answers compared to its competitors for a given set of topics or queries.
Brand Mention Tracking: Monitoring how and where a brand is mentioned across the web and inside AI-generated answers, whether linked or not.
Prompt: The question or instruction a user types into an AI tool, functionally similar to a search query.
Retrieval-Augmented Generation (RAG): A technique some AI systems use to pull in real, current web content at the moment of answering a question, rather than relying only on what the model learned during training.
llms.txt: A proposed, emerging standard file that gives AI crawlers a structured summary of a website’s key content, similar in concept to a sitemap but built for AI systems.
Neighborhood of Trust: A term describing how AI systems tend to trust and cite content more when it’s linked to and referenced by other already-credible sources.
Answer-First Content (BLUF): A content structure, standing for “bottom line up front,” that states the direct answer to a question in the first sentence or two, which both AI systems and time-pressed readers tend to prefer.
If you want to see which platforms actually help with this, our roundup of the best AI search optimization tools covers the tools worth testing.
Analytics & Reporting
Google Analytics 4 (GA4): Google’s current web analytics platform, tracking users, sessions, events, and conversions.
Google Search Console: A free Google tool reporting how a site performs in Google Search, including clicks, impressions, average position, and indexing issues.
Click-Through Rate (CTR): The percentage of people who click a result after seeing it, calculated as clicks divided by impressions.
Bounce Rate: The percentage of visitors who leave a site after viewing only one page.
Conversion Rate: The percentage of visitors who complete a desired action, like a purchase or form submission.
Impressions: The number of times a page or ad appeared in search results, whether or not it was clicked.
Average Position: The average ranking position a page holds in search results for a given query, as reported in Search Console.
Organic Sessions: Website visits that originated from unpaid search results.
Dwell Time: How long a visitor spends on a page after clicking through from a search result before returning to the search results page.
Pogo-Sticking: When a searcher quickly bounces back to the search results after clicking a link, usually a sign the page didn’t answer their query.
Attribution: The process of assigning credit for a conversion to the marketing channel or touchpoint that influenced it.
KPI (Key Performance Indicator): A specific, measurable metric used to track progress toward a marketing or business goal.
Frequently Asked Questions
What is an SEO glossary used for?
An SEO glossary helps marketers, business owners, and content teams understand the terminology that comes up in SEO reports, agency conversations, and strategy discussions, without needing to look up every term separately.
What SEO terms should beginners learn first?
Start with SEO, keyword research, search intent, title tag, meta description, backlink, internal link, and Google Search Console. Those terms explain how pages get found, ranked, and measured.
What is the difference between SEO and GEO?
SEO optimizes a page to rank in traditional search engine results. GEO optimizes content to be understood, trusted, and cited inside AI-generated answers from tools like ChatGPT, Perplexity, and Google AI Overviews. The two overlap heavily since both depend on crawlable, well-structured, credible content, but GEO adds a layer focused specifically on being quoted by an AI system rather than just ranked by one.
Do I need to worry about AI crawlers like GPTBot separately from Googlebot?
Yes, to an extent. Traditional SEO focuses on making sure Googlebot and Bingbot can crawl and index your site. AI crawlers like GPTBot, PerplexityBot, and ClaudeBot are separate bots with their own access rules, so a site can be fully indexed by Google while still being blocked from AI training or retrieval crawlers if robots.txt isn’t configured for both.
How often should this glossary be updated?
Search terminology changes as fast as the tools do. This page gets a real content refresh, not just a date change, every time a new term becomes common in actual SEO and AI search conversations, roughly every two to three months.
Understanding the terms is the easy part. If you want to know whether your site is actually showing up in AI-generated answers, not just Google’s traditional results, Yaaply can take a look at where you currently stand.