AEO vs SEO: what is the difference?
SEO competes for a position on a results page; AEO competes to be the source an AI answer cites. The difference is the unit: SEO optimizes a page against a ranked list, while AEO optimizes a passage and an entity against a generated answer that may show no list at all. Ranking well and being cited are related, but they are not the same outcome and they do not always move together.
| SEO | AEO | |
|---|---|---|
| Goal | Rank on a results page | Be the source the answer cites |
| Unit optimized | The page | The passage and the entity |
| What the user sees | A list of links to choose from | One composed answer, sometimes with sources |
| Measured by | Position, impressions, clicks | Citations, entity resolution |
| Reported by the platform | Yes, in a search console | No. You observe it yourself or not at all |
| Stability | Positions move slowly and can be tracked daily | Answers vary between runs, locales and sessions |
Ranking is not citation
The most common mistake is to assume that whatever ranks first gets cited. In the runs recorded in the citation log, engines answering the same question cited different sources from one another on the same day, and in several runs an engine answered with no citation at all while a full page of ranked results existed underneath. A strong position is useful and it is not a guarantee.
The reverse also happens. Pages get cited in answers without being the top-ranked result for the query, because what the engine needs is a passage that states the thing plainly and an entity it can resolve, not the page that won the ranking contest.
What carries over
Most of the technical foundation is shared, and this is the part that gets oversold as new. A page still has to be crawlable, fast enough, served at a stable URL, and readable without depending on client-side rendering. Structured data still helps a machine parse what the page already says. None of that is specific to answer engines; it is ordinary competence, relabeled by people selling the relabeling.
What genuinely differs
Three things change. First, the unit: you write passages that answer a question in the first sentence, because that is what gets extracted. Second, the entity: the same name, description and identifiers across every page and profile, so a machine can tell which person or organization you are. Third, and least discussed, the measurement: there is no console for this, so if you do not run the queries yourself on a schedule you have no data, only impressions.
Which one deserves the budget
Both, in that order: the technical foundation first, because an answer engine cannot cite a page it cannot fetch. Past that, the honest answer depends on evidence you have to gather yourself. If the queries your customers actually type already return AI answers with sources attached, citation work has somewhere to land. If they still return an ordinary list of links, position carries the traffic and AEO is a hedge against a change that has not arrived yet in your market. Nobody can tell you which of those is true for your queries without running them.
Does one replace the other
No, and the framing is wrong. Answer engines draw on the same web that search engines index, so work that makes a page findable still applies. What changes is the outcome you can be held to: appearing in a list you can verify in a console, or being cited in an answer that nobody reports to you and that may differ by country. The method for checking the second is in how to measure AEO, and the dispute over the title itself exists largely because so few of the claims around it were ever measured.