GlossaryAI search
What is answer engine optimization (AEO)?
Also called: AEO, answer engine
Definition
Answer engine optimization (AEO) is structuring content so that systems which answer questions directly, such as featured snippets, voice assistants and AI chatbots, can pick it up and present it as the answer.
Answer engine optimization (AEO), explained
An answer engine is anything that responds with an answer instead of a list of links: Google's featured snippets and "People also ask" boxes, voice assistants, and now AI assistants like ChatGPT and Perplexity. AEO is the older of the two terms you'll hear; GEO arrived with generative AI. Today they overlap so much that most people use them interchangeably.
If there's a difference, it's emphasis. AEO focuses on the answer itself: can a system lift a short, correct, self-contained response from your page? GEO focuses more broadly on being retrieved, trusted and cited by generative systems, including brand mentions across the web.
The core AEO habits are simple and reusable. Put the question in a heading, in the words people use. Answer it in the first one or two sentences below, without needing context from elsewhere on the page. Then go deeper for readers who want more. Use real HTML lists for steps and tables for comparisons. Keep one idea per section so a system can quote a section cleanly.
That's the structure this glossary uses: every entry opens with a definition written to be quoted on its own, and the detail follows.
A caution about markup. For years, AEO advice leaned on FAQ and HowTo structured data. Google no longer shows FAQ rich results, and it says its AI features don't require any special markup. Visible, well-structured text is what gets read. Markup is a nice extra, not the strategy.
The trade-off is real: when an answer is shown in full, fewer people click. AEO works best for questions where a short answer leads to a bigger need, like "what is llms.txt" leading to "generate one for my site", so the citation brings the right visitors.
Why it matters for founders
Answer-first writing makes the same page work for classic search, featured snippets and AI assistants. It's one habit with three payoffs, and it costs nothing but editing discipline.
Example
Under the heading "Does llms.txt help Google rankings?", the first line reads "No. Google says Google Search ignores llms.txt files." That sentence is easy for a snippet or an assistant to quote, with a link back.
Common mistakes
- Long preambles before the actual answer.
- Answers that only make sense with the paragraph above them.
- Relying on FAQ markup for visibility Google no longer gives it.
- Answering questions nobody asks.
Sources
Checked
Related terms
- Generative engine optimization (GEO)Generative engine optimization (GEO) is the practice of making your content more likely to be found, used and cited in answers from AI systems like ChatGPT, Perplexity, Claude, Gemini and Google's AI Overviews.
- Featured snippetA featured snippet is a Google result where the descriptive snippet appears first, above the link, to answer a query directly. Google picks it automatically; there's no markup that makes a page one.
- FAQ schemaFAQ schema is FAQPage structured data that marks up a list of questions and answers on a page. Google no longer shows FAQ rich results in Search, but the markup remains valid schema.org.
- LLM citationAn LLM citation is a link or named source that an AI assistant shows alongside its answer to say where information came from. Being cited sends referral traffic and signals that your page was trusted.