AEO (Answer Engine Optimization) is the practice of optimising web content so that AI-based answer engines such as ChatGPT, Perplexity or Google AI Overviews select it and cite it directly as a source for their answers.
You speak into the tube and someone answers, not a list
What AEO measures, how it differs from SEO and GEO, how answer engines work, and which mistakes keep content out of the citation.
You speak into the tube and someone answers, not a list
What AEO means
AEO covers the techniques aimed at getting an AI-based answer engine to pick a particular piece of content as its source when answering a user's question. Traditional SEO optimises a page to hold a good position inside a list of links. AEO optimises the content to be the answer itself, quoted or summarised within a text generated by AI.
AEO does not replace technical SEO. Content that is badly indexed or has crawling problems will never reach an answer engine, however well written it is.
How AEO works
Answer engines work in two phases. First they crawl and index web content, or retrieve it at query time using RAG (Retrieval-Augmented Generation). Then a language model picks the passages most relevant to the question and generates an answer that may quote, summarise or link those sources.
For a piece of content to stand a chance of being picked, it has to meet several conditions. The first is access: each engine uses its own crawler, such as GPTBot, PerplexityBot or Google-Extended, and if robots.txt blocks them, that content drops out of the process entirely. The second is structure: engines prefer passages that answer a question in one or two clear sentences before going into detail. The third is markup: structured data such as FAQPage or HowTo helps identify which part of the text is the question and which is the answer. Many engines also weigh authority signals from the whole domain, such as other quality pages or external mentions, before trusting a specific passage on that page.
About llms.txt
Some sites publish an llms.txt file with a summary of their content aimed at language models. Real adoption by the major engines remains minimal. Google has said in public that it does not crawl the file and does not use it as a signal, and its guidance on optimising for AI repeats that you do not need to create new files to appear in Search. Publishing it does no harm, but it is not a lever.
Crawler access decides before text quality does. Without it, the best passage never gets evaluated.How it differs
AEO versus SEO and GEO
The three terms often get used as synonyms and they are not quite the same. AEO came first, tied to voice assistants and Google's featured snippets, and it covers any system that answers questions directly. GEO focuses specifically on generative engines such as ChatGPT or Gemini. In practice they share most of the techniques, and the difference matters mainly when you decide what to measure.
The practical distinction sits elsewhere: AEO does not work without technical SEO underneath it. If the content is not crawled, if it is not indexed, or if it lives behind a rendering step the bot never runs, none of the three disciplines has anything to work with.
Why it matters
When a user asks an AI assistant something and gets a direct answer, they often never visit a page at all. Being cited inside that answer is, in many cases, the only visibility available for that query. That is why AEO counts even without a click: the competition is over which source the AI chooses to mention.
That citation is worth more than the click itself. A user who sees a brand named as a source inside a ChatGPT answer or an AI Overview reads it as a vetted reference, which is a different thing from seeing it as one more result among ten blue links. In businesses where the purchase decision runs through several informational searches before the transactional one, being present in those intermediate answers shapes which brands reach the final comparison.
Ignoring AEO costs more than a ranking position. It leaves you absent from a discovery channel that keeps gaining weight.
Best practices
Answer the question in the first sentence of the paragraph or section, before adding any context.
Use structured data (FAQPage, HowTo, Article) so the engine can see clearly how question and answer relate.
Check robots.txt and make a deliberate decision about which AI crawlers get access to the content.
Put concrete, verifiable figures inside the text itself, not only in charts or tables an engine cannot read.
Organise the content in short sections with one heading per question, rather than one continuous block of text.
Keep a single canonical version of each answer on the site, so you are not competing with yourself for the same citation.
Common mistakes
Blocking AI crawlers in robots.txt without noticing, while still letting Googlebot through.
Writing several paragraphs of context and background before giving the actual answer to the question.
Repeating the same question on several pages of the site, which muddies which version ends up cited.
Treating AEO as an isolated list of tricks, with no technical SEO base to get the content crawled and indexed first.
Publishing long content with no structured markup at all, leaving the engine to work out on its own what is question and what is answer.
Manuel Riveiro RodriguezCEO & Digital Strategist
Want to know how this applies to your site? We will go through it with you.
Traditional SEO aims to put a page high in a list of links, and it depends on the user clicking. AEO aims to get an answer engine to quote or summarise that content inside its answer, with or without a click afterwards. The techniques overlap; the end goal does not: position versus citation.
Which AI engines benefit from AEO?
AEO applies to any system that generates answers from third-party content: ChatGPT with browsing, Perplexity, Google AI Overviews and AI Mode, plus voice assistants. Each one uses its own crawler and its own criteria, so the same content can be cited by some engines and ignored by others.
Do you need to change anything in robots.txt for AEO?
Yes. Each answer engine uses its own user-agent to crawl content, such as GPTBot or PerplexityBot. If robots.txt blocks them, that content cannot be cited however well structured it is. Review the file and make a deliberate decision about which AI crawlers get access.
Does AEO replace SEO?
No. AEO is built on a solid technical SEO base: indexable content, reasonable load speed, domain authority. Without that base no answer engine finds or trusts the content, however well structured it is for answering questions.
How do you measure whether AEO is working?
There is still no single standard tool. In practice you combine regular checks of what the main engines answer to your target questions with the referral traffic arriving from those engines in your analytics, where that data is available.
