The definition
An answer engine takes a question and returns a composed answer, drawing on sources it retrieved along the way. Assistants, AI overviews inside classic search, and the research and shopping agents built on top of them are all answer engines. AEO is the practice of making your page one of the sources that survives that process intact.
The thing that changed is not a ranking factor. It is that the reader changed shape. A browser renders a page; a parser does not. A person skims past the navigation to find a price; a parser spends context on every byte of that navigation before it reaches the price, and may give up first. Almost everything else in AEO follows from that one difference.
AEO and SEO, side by side
AEO builds on SEO rather than replacing it. Classic search still sends most of the traffic on most sites, and the crawlability work it rewards is the same work an answer engine needs. What changes is which properties of a page matter after it has been retrieved.
| SEO | AEO | |
|---|---|---|
| Who reads it | A crawler, then a person | A parser, under a token budget |
| What you win | A position in a list | Being usable as a source |
| Layout | Helps the person who clicks | Costs context before your facts |
| Client-rendered content | Often indexed | Absent from the response |
| Response size | A speed signal | A hard limit on how much is read |
| Feedback | Weeks | One request |
The label question follows immediately, so it is worth settling: AEO, GEO and LLM SEO name overlapping work sold by different people. GEO vs SEO takes the comparison apart, and the full method is here.
The four things it actually requires
- The fetch is allowed. A
robots.txtline or a CDN bot rule ends it here, silently, with nothing logged on your side. - The response is parseable. Anything that appears only after JavaScript runs does not exist, because the fetch runs none.
- The facts are cheap to reach. The engine reads under a budget. A first fact behind tens of thousands of characters of markup may be dropped for a shorter source.
- The facts agree with themselves. When your prose and your structured data differ, the assistant picks one and you do not choose which.
Notice what is missing: keyword placement, word count and heading density. There is no position in a generated answer to compete for, so the tactics built around occupying one have nothing to act on.