Glossary
The vocabulary of AI visibility is young and inconsistent across the industry. These are the definitions AppearIn AI uses, in the sense they're used throughout these docs.
- AEO (Answer / Agentic Engine Optimization)
- Optimizing so AI assistants and agents can use your site, clean docs, APIs, and machine-readable content. See What is GEO & AEO?
- AI crawlers
- Bots like GPTBot (OpenAI), ClaudeBot (Anthropic), and PerplexityBot that crawl the web for AI training and retrieval. Unlike Googlebot, most can't execute JavaScript, so server-side rendering matters.
- AI engine
- An AI assistant that generates answers. AppearIn currently tracks ChatGPT, Gemini, and Perplexity. See AI engines we track.
- AI visibility
- How present, trusted, and accurately framed your brand is inside AI-generated answers. See AI visibility.
- Answer capsule
- A concise 15–80 word summary placed immediately after a heading. A high-impact GEO pattern, it gives engines a clean, quotable block to extract.
- Brand profile
- The structured set of confirmed facts about your brand, name variations, competitors, features, pricing, that AppearIn AI checks answers against and uses to detect mentions.
- Citation
- A reference where an engine links to a specific page as the source of part of its answer. See mentions, citations & sources.
- Citation worthiness
- The quality of containing specific, attributable information, statistics, expert quotes, original data, that makes an engine more likely to cite your page over a competitor's.
- E-E-A-T
- Experience, Expertise, Authoritativeness, Trustworthiness, Google's quality-rater framework, increasingly used by AI engines to decide which sources to trust.
- GEO (Generative Engine Optimization)
- Optimizing content so generative engines cite your site in their answers. See What is GEO & AEO?
- Hallucination flag
- An alert raised when an engine states something false about your brand. See hallucination flags.
- Leaderboard
- A ranking of your brand against tracked competitors by Share of Voice, per engine. See Share of Voice.
- llms.txt
- A proposed standard: a markdown file at /llms.txt giving engines a token-efficient index of your most important pages. Think robots.txt, but for LLMs.
- Mention
- Any appearance of your brand name in the text of an answer. The basis of visibility and Share of Voice. See mentions, citations & sources.
- Mention rate
- The share of your most recent answers — your latest run on each engine — that mention your brand. It is tracked separately from Share of Voice, which compares your mentions with competitor mentions.
- Model Context Protocol (MCP)
- An open protocol that lets AI agents discover and call your APIs directly. An MCP server makes your platform a first-class citizen in the agent ecosystem.
- Net sentiment score
- A single −100 to +100 reading of how favorably engines describe your brand: the share of positive mentions minus the share of negative ones, across all rated mentions. Neutral mentions count as passive, dampening the score toward zero without pushing it negative. Higher is better. See sentiment.
- OpenAPI / Swagger
- A specification format for describing REST APIs. An OpenAPI spec lets AI agents auto-generate integration code for your platform.
- Per-engine breakdown
- Any metric shown separately for each engine rather than averaged, since engines often disagree. See AI engines we track.
- Prominence
- How early and how central a brand mention is within an answer. A first-sentence recommendation counts more than a closing aside.
- Prompt
- A question sent to the AI engines on your behalf, ideally phrased the way a real customer would ask it.
- Prompt set
- The full list of prompts tracked for a project. Your coverage is only as broad as this set. See how we collect data.
- Schema markup (JSON-LD)
- Structured data embedded in your HTML that tells engines what a page is about, article type, author, dates, products, FAQs, making it easier to extract and attribute.
- Sentiment
- How favorably an answer describes your brand, positive, neutral, or negative. See sentiment.
- Sentiment driver
- A recurring theme (pricing, support, integrations) that an engine attaches to your brand, explaining why sentiment moves.
- Server-side rendering (SSR)
- Rendering HTML on the server before sending it to the browser. Critical for GEO because most AI crawlers can't run client-side JavaScript, content that's rendered only on the client is invisible to them.
- Source
- Any page an engine drew on for an answer, yours or not, the ecosystem that shapes what AI says about your category. See mentions, citations & sources.
- Visibility metrics
- The metric set AppearIn uses to measure AI visibility: organic Share of Voice, mention rate, citation rate, sentiment, sources, and per-engine trends. See AI visibility.
- Zero-click
- When an AI answer satisfies the user without any click to a website. If you're not in the answer, there's no link left to earn.