The language surrounding AI search engine optimization is evolving fast. Below are the terms you'll want to know.
- ACPAgentic Commerce Protocol
- The open standard (OpenAI and Stripe) that lets a store be bought from directly inside an AI assistant.
- AEOAnswer Engine Optimization
- Structuring a store so AI answer engines find, trust and recommend it.
- Agentic Commerce
- Shopping in which an AI assistant completes the purchase in-chat, rather than only recommending a product.
- AI Overviews
- Google's AI-generated summaries atop the results page; a citation inside one is a core AEO goal.
- AI Visibility
- How often and how prominently a brand appears across AI answers — the AEO equivalent of rankings.
- Answer Engine
- A tool that answers a question directly instead of returning a list of links (ChatGPT, Perplexity).
- Branded Search
- A query that includes a brand's name; AI recommendations frequently trigger it.
- Citations
- When an AI links to your page as a named source. Stronger than a mention.
- Closed Surfaces
- An AI channel that draws only from its own catalog and seals out crawlers — chiefly Amazon's Rufus.
- CrawlerBot
- A program that reads web pages for indexing or AI use; your robots.txt decides which may enter.
- E-E-A-TExperience, Expertise, Authoritativeness, Trust
- Google's framework for judging content quality and which sources AI trusts.
- Entity
- A distinct, known thing — brand, product or place — that AI recognizes and can recommend.
- GEOGenerative Engine Optimization
- Optimizing content to appear in AI-generated answers; used interchangeably with AEO.
- Hallucination
- When an AI states something false with confidence; complete, structured data lowers the odds.
- Knowledge Graph
- Google's database of known entities and the verified facts that connect them.
- LLMLarge Language Model
- The AI behind tools like ChatGPT, Gemini and Claude, trained on vast amounts of text.
- llms.txt
- A proposed guide-file for AI models — but Google has said it doesn't use it.
- Machine-Readable
- Content a program can reliably extract — in text and structured data, not images or JavaScript-only.
- Mentions
- A reference to a brand inside an AI answer, named without necessarily being linked.
- Merchant Center
- Google's platform for the product feed that powers Shopping and, in turn, much of AI shopping.
- Open Surfaces
- AI shopping channels you earn into with clean data — ChatGPT, Google AI Overviews and Gemini, Perplexity, Copilot.
- PDPProduct Detail Page
- A single product's page — the one that must be machine-readable to earn AI citations.
- Product Feed
- A structured catalog file submitted to a platform; the entry requirement for most AI shopping surfaces.
- Rich ResultRich Snippet
- An enhanced listing — star rating, price, image — generated from structured data.
- robots.txt
- The file telling crawlers what they may read; step one is not blocking the AI bots you want.
- Schema MarkupJSON-LD
- The shared vocabulary (Schema.org) and code format that label page content for machines.
- SERPSearch Engine Results Page
- The page a search engine returns — now led by AI Overviews and shopping modules.
- Shopping Graph
- Google's product database that powers its shopping and AI results.
- Structured Data
- Standardized labels on a page (price, rating, availability) that make it easy for AI to quote.
- Zero-Click Search
- A search answered on the results page itself, so the user never clicks through.