GEO vs SEO vs AEO: What's the Difference?

SEO, AEO and GEO are three names for overlapping work. SEO (search engine optimization) helps pages rank in search results. AEO (answer engine optimization) shapes content so search tools can lift a direct answer. GEO (generative engine optimization) aims to get your content used and cited in AI-written answers. They share one foundation: pages that can be crawled, indexed and understood. This comparison is part of our AI search optimization guide.

Goal: what each one optimizes for

SEO aims to rank a page for the searches that matter to your business. Success is a visible position and the clicks that follow.

AEO narrows the goal to the answer itself. It is an older label, used for work aimed at featured snippets and voice answers. Google's own guide defines the term simply as "answer engine optimization." The aim is for a search tool to show your wording as the reply to a question, in a featured snippet or a voice response. The page is the source; the answer is the product.

GEO goes one step further. An AI engine reads several pages and writes its own answer. Your goal is for that answer to use your content and credit you with a citation, ideally while describing your business accurately. The research that named GEO argued that ranking position alone cannot measure this. A source can be cited first, last or barely at all inside the same answer. Read more in what generative engine optimization is.

Where your content shows up

SEO results appear as links in classic search results. AEO results appear in answer features: featured snippets on Google, and spoken answers from voice assistants.

GEO results appear inside AI-written answers. Today that mainly means Google AI Overviews and AI Mode, ChatGPT search and Perplexity. Each shows sources in its own way. Google shows supporting links alongside the overview. Perplexity uses numbered citations. ChatGPT shows citations and a list of sources.

The layout differs too. Classic results put a list of links first. An AI answer puts a written summary first, with sources attached to parts of it. Your page may be represented by one passage, so the quality of that passage, and how the answer describes your business, matters as much as whether you are linked.

There is also a difference in how often the surface appears. Google says AI Overviews show only when its systems judge them additive to classic results, so they often don't trigger. A classic result can appear for almost any query. An AI answer cannot be counted on in the same way.

What content each one asks for

SEO asks for a page that matches search intent, with a clear title, useful headings and enough depth to satisfy the searcher.

AEO asks for compact answers. A question as a heading, a direct two or three sentence reply below it, then detail. Lists and tables help when the answer is a set of steps or values.

GEO asks for passages that still make sense when lifted out of the page. An AI engine may pull one paragraph to answer a narrow sub-question. Google says AI Overviews and AI Mode may run related searches across subtopics, and OpenAI says ChatGPT rewrites questions into targeted queries. In the GEO research, adding cited sources, quotations and statistics improved visibility, while keyword stuffing did not.

Technical requirements

SEO and AEO share the same technical base. Pages need to return a 200 status, be crawlable under robots.txt, be indexable and be reachable through internal links. Featured snippets are chosen automatically by Google's systems: Google's featured snippets documentation says you can't mark a page as one.

GEO adds one layer: AI crawler access. Google AI features use Googlebot, so no extra step is needed there. Google says there are no additional technical requirements, no special schema and no new AI text files needed to appear. ChatGPT search and Perplexity use their own crawlers, OAI-SearchBot and PerplexityBot. If your robots.txt, CDN or firewall blocks them, those tools cannot read your pages for search answers.

How you measure results

SEO has mature measurement. Search Console reports clicks, impressions and average position for each query and page.

AEO measurement is patchier. You can see whether you hold a featured snippet by checking results, and Search Console counts those clicks and impressions with your other web results.

GEO measurement is the newest. Google counts AI Overview and AI Mode clicks and impressions inside the Search Console Performance report. Every link in an AI Overview gets the same position: the position of the overview itself.

Which should you choose?

You don't have to choose one. The three stack.

Start with SEO, because every engine in this comparison depends on pages it can crawl and index. If Search Console shows indexing problems, fix those before anything else.

Then add AEO habits: put a direct answer under each question heading. It costs little and helps both classic and AI results.

Then add GEO: check AI crawler access, back key claims with specific sourced facts, and start tracking where AI tools cite you. If you want a team to run that, our in-house SEO team does this work end to end, including reporting on where clients are mentioned in Google AI Overviews and ChatGPT. For the Google side in detail, read how Google AI Overviews choose sources.

All three are approaches, not products. Criteria were set before the verdict, and each is judged on the same five criteria using the engines' own documentation.