The alphabet soup, decoded
The short answer: SEO optimizes for a ranked list of links — its judge is Google's algorithm. AEO and GEO are two names for nearly the same newer practice: getting cited inside AI answers — their judges are ChatGPT, Gemini, and Perplexity. And behind all three sits one plain-English goal: be the answer AI gives your customer. That's Answer Optimization (AO).
If you run a business and keep hearing these acronyms, here's the honest decoder — including the part most articles skip: two of the three terms mean almost the same thing, and none of them is the goal. They're tactics. The goal has a simpler name.
| What it optimizes for | The judge | Where the term came from | |
|---|---|---|---|
| SEO Search Engine Optimization | Ranking in a list of links on a results page | Google's ranking systems | The original discipline, ~25 years old |
| AEO Answer Engine Optimization | Being cited in the single answer an engine gives | ChatGPT, Gemini, Perplexity, Google AI Mode | The SEO industry's name for the shift |
| GEO Generative Engine Optimization | Being cited by generative engines (same shift) | The same AI engines | Academic research — the 2023 GEO paper, a 10,000-query study |
| AO Answer Optimization | The goal itself: being the answer — found, verified, recommended | Your specific customer's actual question | The plain-English name we use at aoaudit.com |
Ask ten marketers the difference between AEO and GEO and you'll get ten confident answers that don't survive contact with the checklist — because in practice, the work is identical: open your site to AI crawlers, install schema, publish answer-shaped content, keep your profiles consistent, earn real reviews and mentions. AEO is what the SEO industry called the shift; GEO is what the researchers called it. Same building, two signs on the door.
This one matters. SEO's contest is a list — ten blue links, and page two exists (nobody visits, but it exists). The AI contest is an answer — one or two names, spoken or written, and there is no page two of an answer. A billion people now search with Google's AI Mode; ChatGPT recommends businesses by name and sends shoppers to their sites. The skills overlap, but the judges changed — and the judges now read different signals: ChatGPT's search citations trace overwhelmingly to Bing's index (~87%), Gemini reads your Google Business Profile as a data source, and Perplexity quotes pages that answer plainly.
None of them, by name. You do the checklist they all share — by leverage order: open the doors (robots.txt + llms.txt) → valid schema → claim Google, Bing, Apple, Yelp → publish real prices and a real FAQ → make every source agree. Then you measure the thing that actually matters: your AI visibility — whether machines can find, verify, and recommend you. That's checkable, free, in about 60 seconds.
Honest limit: whatever the acronym, nobody can guarantee what an AI answers on a given day. What you control is whether every engine can read, verify, and quote you. Anyone selling guaranteed #1 in ChatGPT — under any acronym — is selling weather.
See where you stand — free AO Audit, 60 seconds →
Almost none in practice — two names for the same work of getting cited by AI engines. AEO came from the SEO industry; GEO from academic research. The tactics overlap nearly completely.
No. SEO targets a ranked list of links; AEO targets the single answer an AI gives. SEO is the foundation; AEO adds machine-readability requirements SEO never tested.
You need the goal behind all three: being the answer AI gives your customer — AO. The work is one checklist, whatever you call it.
SEO is the foundation (it feeds the indexes AI reads), AEO/GEO is the building, being the answer is the point. The weight is shifting toward the answer.