Reference
Glossary
Short, plain-language definitions for the terms that come up across our research — expanded where it helps.
A
- AI Overview An AI Overview is an AI-generated summary that Google displays at the top of search results for certain queries, citing sources drawn from multiple web pages.
- Answer Engine Optimization (AEO) Answer engine optimization is the practice of structuring content so it can be directly quoted as a complete, accurate answer by AI chat assistants and voice search systems.
C
- Canonical Tag A canonical tag is an HTML element that tells search engines which URL is the preferred, master version among a group of duplicate or near-duplicate pages.
- Canonicalization Canonicalization is the process search engines and site owners use to choose one authoritative URL when multiple addresses return the same or similar content.
- ccTLD A ccTLD is a country-code top-level domain, such as .de for Germany or .jp for Japan, that gives search engines a strong signal a site targets one specific country.
- Click Depth Click depth is the number of clicks required to reach a specific page starting from a website's homepage, which strongly affects how often and how deeply crawlers reach it.
- Client-Side Rendering (CSR) Client-side rendering is a JavaScript approach where the browser builds a page's content after loading, requiring crawlers to execute JavaScript to see it.
- Core Web Vitals Core Web Vitals are Google's three standardized page-experience metrics measuring loading speed, interaction responsiveness, and visual stability during a page's lifecycle.
- Crawl Budget Crawl budget is the number of URLs a search engine is willing and able to crawl on a given site within a set period, shaped by site size, speed, and authority.
- Crawling Crawling is the process by which a search engine discovers and downloads web pages by following links, sitemaps, and other URL signals across the web.
- Cumulative Layout Shift (CLS) Cumulative Layout Shift is a Core Web Vital that measures how much a page's visible content unexpectedly shifts or moves around while the page is still loading.
E
- E-E-A-T E-E-A-T stands for Experience, Expertise, Authoritativeness, and Trustworthiness, the framework Google's quality raters use to assess content and site credibility.
- Entity SEO The practice of helping search and AI systems recognize a brand, person, or concept as a distinct, well-defined entity.
F
- Faceted Navigation Faceted navigation is a filter-based browsing system, common on e-commerce sites, that can generate a very large number of near-duplicate, crawlable URLs.
- FAQPage Schema FAQPage schema is a type of structured data that marks up a list of questions and answers so search engines can parse and understand their content and structure.
- Featured Snippet A featured snippet is a highlighted search result, shown above standard listings, that directly answers a query using an extract pulled from a ranking page.
G
- Generative Engine Optimization (GEO) Generative engine optimization is the practice of optimizing content and technical setup to improve visibility and citation within AI-generated search answers.
- Geotargeting Geotargeting is the practice of signaling to search engines that a website, or a specific section of it, is intended for users in a particular country or region.
- GPTBot GPTBot is OpenAI's web crawler used to gather publicly available content for training its AI models, which site owners can allow or block via robots.txt.
H
- Hreflang Hreflang is an HTML attribute that tells search engines which language and region a specific page version is intended for among translated alternatives.
- HTTPS HTTPS is HTTP delivered over an encrypted connection, confirmed as a lightweight Google ranking signal and required for many modern browser features to work.
- HTTPS Migration HTTPS migration is the process of moving a website from unencrypted HTTP to encrypted HTTPS, requiring careful redirects to avoid losing search rankings.
I
- Indexing Indexing is the process of storing a crawled, rendered page in a search engine's database so it can be retrieved and shown for relevant search queries.
- Interaction to Next Paint (INP) Interaction to Next Paint is a Core Web Vital that measures the latency of every user interaction on a page, and it officially replaced First Input Delay in March 2024.
- Internal Linking Internal linking is connecting pages within the same website through hyperlinks, distributing authority and helping search engines discover and prioritize content.
L
- Largest Contentful Paint (LCP) Largest Contentful Paint is a Core Web Vital that measures how long it takes for the largest visible content element on a page to finish rendering on screen.
- llms.txt llms.txt is a proposed markdown file, separate from robots.txt, designed to give AI systems a clean, prioritized map of a website's most important content and pages.
- Log File Analysis Log file analysis is reviewing a server's raw access logs to see exactly which URLs search engine crawlers requested, independent of any sampled reporting tool.
M
- Meta Robots Tag A meta robots tag is an HTML element placed in a page's head section that tells search engines whether to index that specific page and whether to follow its links.
- Mobile-First Indexing Mobile-first indexing is Google's default practice of using a site's mobile version of a page, rather than its desktop version, for indexing and ranking.
R
- RAG (Retrieval-Augmented Generation) A technique where a generative model retrieves relevant documents or passages before generating a response, grounding its answer in real content.
- Redirect Chain A redirect chain is a sequence of two or more redirects a single URL passes through before reaching its final destination, wasting crawl budget and losing link value at each hop.
- Redirect Map A redirect map is the complete, documented list matching every old URL to its correct new URL, used to plan and execute a website migration or restructure safely.
- Rendering Rendering is executing a page's HTML, CSS, and JavaScript to produce the final content that a browser or search engine crawler actually sees and evaluates.
- Rich Results Rich results are enhanced search listings, such as star ratings, FAQs, or recipe cards, generated automatically from a page's valid structured data markup.
- Robots.txt Robots.txt is a plain-text file placed at a website's root directory that tells search engine crawlers which URL paths they may or may not request and crawl.
S
- Schema Markup Schema markup is structured code, following the shared schema.org vocabulary, that explicitly describes a page's content in a format search engines can parse directly.
- Server-Side Rendering (SSR) Server-side rendering generates a page's complete HTML on the server before sending it to the browser, so crawlers can read content without running JavaScript.
- Site Architecture Site architecture is the overall organization of a website's pages and the links connecting them, shaping both user navigation and how efficiently crawlers move through it.
- Site Migration A site migration is any major change to a website's domain, URL structure, or platform that requires careful planning to preserve existing search rankings.
- Soft 404 A soft 404 is a page that returns a 200 OK status code despite having thin, missing, or error-like content that functionally behaves like a dead page.
- Structured Data Structured data is standardized code embedded in a page that labels its content for machines, helping search engines understand context beyond plain text.