AEO vs GEO vs SEO: what each one is and which you need

SEO gets your page ranked in a list of links. AEO gets your page used as the answer to a question. GEO gets your brand named and cited inside an AI-written response from ChatGPT, Perplexity, Gemini or Google's AI Overviews.

Most of the work is shared. A site that is easy to crawl, says clearly what it is and answers questions directly does well at all three. The differences are real but smaller than the acronyms suggest, and anyone selling you three separate strategies is billing you three times for one foundation.

SEO vs AEO vs GEO at a glance

What is SEO?

Search engine optimization is the work of getting pages into a search engine's index and ranking them for the queries your customers type. It covers three things.

The technical layer decides whether Google can fetch and index the page at all. That means robots.txt rules, status codes, canonical tags, sitemaps and pages that render without errors.

The relevance layer decides which queries the page matches. Titles, headings, body copy and internal links tell the engine what the page is about.

The authority layer decides where it ranks against everyone else matching the same query. Backlinks still do most of the work here.

SEO success is a click. Your page is one of ten blue links and the searcher picks it.

What is AEO (answer engine optimization)?

Answer engine optimization is formatting content so a search engine or assistant can lift a passage and present it as the answer. The term grew up around featured snippets and voice search, where there is one answer and no list.

AEO is mostly a writing discipline:

• Put the question in a heading, using the words people search with.
• Answer it in the first 40 to 60 words under that heading, before any background.
• Use lists and tables for steps and comparisons, because engines extract them cleanly.
• Mark up the page with schema so machines know what each part is.

One caution on schema. Google cut FAQ rich results back to government and health sites in August 2023 and stopped showing them for everyone on May 7, 2026, so FAQ markup no longer buys any site the expanded result it used to. It still labels your content for machines, which is why it stays on AEO checklists.

The awkward part of AEO is that a perfect answer can remove the reason to click. You win visibility and sometimes lose the visit. That trade gets sharper with AI answers.

What is GEO (generative engine optimization)?

Generative engine optimization is getting your content used, quoted or cited when a large language model writes an answer. The name comes from a 2023 research paper by a team from Princeton, Georgia Tech, the Allen Institute for AI and IIT Delhi. They tested rewrites across thousands of queries and found that adding statistics, quotations and cited sources lifted a page's visibility in generated answers by up to 40%.

GEO adds three concerns that classic SEO rarely touched.

AI crawler access. ChatGPT, Claude and Perplexity send their own bots, such as OAI-SearchBot, ClaudeBot and PerplexityBot. A robots.txt written years ago may block some of them by accident, and a CDN bot-protection setting can block the rest.

Content that exists without JavaScript. Most AI crawlers fetch raw HTML and do not run your scripts. If your product details load client-side, the crawler sees an empty shell.

Your brand as an entity. AI engines describe companies from what the web says about them. Consistent names, Organization schema with sameAs links and mentions on sites the models trust all shape the description you get.

A GEO win is a citation or a mention. Sometimes that sends a click. Often it shapes a buying decision you never see in analytics.

Where SEO, AEO and GEO overlap

Google's AI Overviews and AI Mode draw on pages Google has already indexed. ChatGPT search and Perplexity run their own retrieval, but they also prefer pages that are easy to fetch and quote. So the shared foundation is large:

• Pages that return 200, render server-side and are not blocked.
• One clear topic per page with a descriptive title and headings.
• Direct answers near the top of each section.
• Accurate, valid structured data.
• Specific facts, numbers and named sources instead of vague claims.
• A recognizable brand that other sites mention.

If you only have time for one project, fix this layer. It pays off in all three channels at once.

SEO vs GEO: what actually changes

The biggest change is the unit of competition. In SEO you compete for a position on a page of results. In GEO you compete for a sentence inside one answer, and the engine may pull that sentence from page 3 of Google if it says the thing most clearly.

Second, links matter less and mentions matter more. A brand that appears in Reddit threads, review sites and comparison articles gets named in AI answers even when its own pages rank modestly.

Third, measurement gets harder. Search Console reports AI Overview impressions mixed into ordinary web results, and ChatGPT shows no impression data at all. You end up sampling prompts by hand or with a tool, and tracking referrals from chatgpt.com, perplexity.ai and gemini.google.com in your analytics.

AEO vs GEO: the difference

AEO and GEO both chase the answer slot, so people use the terms interchangeably. The useful distinction is the engine. AEO targets extractive systems that lift your exact text, like a featured snippet. GEO targets generative systems that read several sources and write a new answer, so your words may be paraphrased and your page cited in a footnote.

That changes what you write. For AEO you polish one quotable paragraph. For GEO you make sure the facts in that paragraph are specific enough that a model would rather cite you than summarize a vaguer page.

Which one do you need?

All three, in this order.

1. SEO foundations first. If Google cannot index the page, neither AI Overviews nor most AI search tools will find it either.
2. AEO structure second. Rewriting sections to lead with the answer is cheap and helps every engine.
3. GEO third, sooner if buyers ask AI for recommendations. B2B software, agencies and anything people research with "best X for Y" prompts should check AI crawler access and brand mentions now. A local plumber can wait.

Ecommerce sits in the middle. Product queries still convert through classic search, but shoppers increasingly ask ChatGPT for shortlists, so crawler access and clean Product schema are worth an afternoon.

Check your site for SEO, AEO and GEO in one pass

Our website check runs the shared foundation and the GEO extras together. It covers crawling and indexing, on-page SEO, structured data, content and answer structure, rendering and mobile, performance, site structure, and brand identity on the pages you choose. You can also add a check that asks three AI engines how they describe your brand, which is priced separately.

The result is one prioritized fix list, with technical, content and AI access scores from 0 to 100. Rerun it after you publish changes and it shows how much of the list you have fixed. A quick check of your home page costs no credits and takes about 20 seconds.