Three acronyms are now competing for the same budget line: SEO, AEO, and GEO. Agencies sell them as separate services, tools market themselves as one or the other, and plenty of sensible people reasonably assume they are three different disciplines.
They mostly are not. They are three names for optimizing toward three different kinds of answer surface, and most of the work underneath is shared. This guide defines each term plainly, shows where they genuinely differ, flags the claims that lack evidence, and ends with what you should actually do.
The short definitions
- SEO (search engine optimization) is about ranking a page in a list of results and earning the click. The surface is the classic results page on Google or Bing. Success looks like rankings, clicks, and visits.
- AEO (answer engine optimization) is about being the answer that gets pulled out and shown directly: featured snippets, People Also Ask boxes, voice assistant replies, and now AI Overviews. Success looks like being quoted as the direct answer — sometimes without a click.
- GEO (generative engine optimization) is about being mentioned, recommended, or cited when a large language model writes an answer from scratch, in ChatGPT, Gemini, Claude, Perplexity, or Google’s AI Mode. Success looks like citations and brand mentions inside generated answers.
The unit you optimize changes with each: a page for SEO, a passage for AEO, and your brand’s reputation across the web for GEO. But every column starts with the same requirement: a page that search systems can reach, read, and trust.
Where each term came from
SEO has been in use since the 1990s, when site owners began working to improve their visibility in early search engines. AEO became popular in the late 2010s, as featured snippets, People Also Ask boxes, and voice assistants started answering questions directly instead of just listing links. GEO appeared in 2023, partly from an academic paper that studied how content changes affect citation in generative AI answers — the paper “GEO: Generative Engine Optimization” by Aggarwal and colleagues, first posted in November 2023.
Related labels you will also meet — LLMO (large language model optimization), AIO (AI optimization), and plain “AI SEO” — are mostly vendor terminology for the same territory. Do not let a new acronym convince you a new discipline exists.
Side-by-side comparison
| SEO | AEO | GEO | |
|---|---|---|---|
| Main goal | Rank pages and earn clicks | Be quoted as the direct answer | Be used and cited in AI answers |
| Where it shows | Google/Bing results lists | Featured snippets, voice replies, AI Overviews | ChatGPT, Perplexity, Gemini, AI Mode |
| What you optimize | A page | A passage that answers one question | Your brand’s clarity and trust across sources |
| Main levers | Crawling, indexing, titles, content, links | Question headings, answer-first text, lists, FAQ | AI crawler access, author/date clarity, sources, consistent facts |
| How you measure it | Rankings, clicks, conversions | Snippet ownership, answer presence | Mentions, citations, AI referrals |
The differences are in emphasis and in how success is measured, not in a separate set of techniques. A page that cannot be crawled and indexed cannot rank, cannot be lifted as a snippet, and cannot be cited. The foundation is shared; the surfaces differ.
What Google itself says
This is the part that cuts through most of the sales pitch. Google’s own guidance for its AI features says there are no special optimizations needed for AI Overviews or AI Mode beyond ordinary SEO: to appear as a supporting link, a page must be indexed and eligible to show with a snippet, meeting the standard technical requirements. Its AI optimization guide puts it directly: optimizing for generative AI search is still SEO, because the features are rooted in Google’s core ranking and quality systems.
That means the honest version of AEO and GEO for Google is mostly: publish clear, well-structured, trustworthy pages, and make sure Google can index them. Our companion guide to optimizing content for Google AI Overviews goes through Google’s documented position in detail, including the tactics to ignore — such as special markup for AI search, which Google says does not exist, and llms.txt files, which Google says receive no special treatment.
The same foundation applies before any of this matters. If your pages are not being indexed at all, start with our guide to getting your website indexed by Google and our explanation of why a site might not be showing up on Google.
Where they genuinely diverge
There are real differences worth knowing, even if they are smaller than the marketing suggests:
- Zero-click outcomes. SEO optimizes for the click; AEO often produces an answer with no click at all. That changes what success means — visibility without a visit — and it is a genuine strategic question, not just a measurement quirk.
- The unit of trust. GEO cares about what the wider web says about you, because a language model synthesizes many sources. Consistent business facts, genuine reviews, and citations from sources the model trusts matter more here than on a single page.
- Crawler access. For GEO, whether AI crawlers may read your pages, and whether your main text is in the HTML rather than hidden behind scripts, is a real technical consideration. This is still ordinary technical SEO — crawlability — applied to new visitors.
- Measurement is weaker. Rankings and clicks are measured precisely. Snippet ownership can be tracked, but AI citations and brand mentions are measured by third-party prompt tracking that is far less reliable. Treat any vendor’s “share of answer” number as an estimate, not a fact.
The claim-check table
Use this to test any AEO or GEO pitch you hear:
| Claim | Verdict |
|---|---|
| “You need a separate AEO/GEO strategy from scratch” | Unsupported. The foundation is shared SEO; the differences are formatting and measurement. |
| “Special schema guarantees AI citations” | Unsupported. Google says there is no special markup for generative AI search, and markup must match visible content. |
| “llms.txt will get you cited” | Unsupported for Google. Google says such files receive no special treatment. |
| “AI search replaces SEO” | False. AI answers are drawn from pages that are crawled, indexed, and trusted — which is what SEO builds. |
| “Answer-first formatting helps snippets and AI answers” | Supported as good practice. A question heading with a direct answer below it is easier to lift accurately. |
| “Being cited is guaranteed if you follow the checklist” | False. Google states plainly that meeting all requirements does not guarantee crawling, indexing, or serving. |
What you should actually do
If you are a small publisher or business owner, do not buy three strategies. Do one strategy, in this order:
- Fix the foundation. Make sure your pages are crawlable, indexed, and fast, and that your titles and content match real search intent. Read our guide to search intent if that step is unclear.
- Write answer-first. Use question headings, put a direct one- or two-sentence answer beneath each, then add the detail. This serves readers, snippets, and AI answers at once. Our guide to writing SEO-friendly posts that help readers covers the full workflow.
- Make your facts consistent. Keep business details, author information, and dates identical everywhere you appear, and cite your sources. Consistency is what makes a model confident about mentioning you.
- Measure what is measurable. Track rankings and Search Console clicks precisely; treat AI-mention reports as directional. Do not reorganize your content strategy around a metric you cannot verify.
SEO, AEO, and GEO describe the same goal from three angles: being found, being the answer, and being cited. The acronyms will keep multiplying. The work — clear, honest, well-structured pages that genuinely help the reader — stays the same.
Frequently asked questions
Is AEO the same as GEO?
No. AEO is about having your existing content extracted as a direct answer, mainly in featured snippets and similar features. GEO is about being mentioned or cited when an AI model generates a new answer. They overlap in AI Overviews, which are generated but closely tied to ranking pages.
Is GEO replacing SEO?
No. AI answers depend on crawlable, indexed, and trustworthy pages, which is what SEO builds. GEO adds attention to AI crawlers, passages, and citations on top of that foundation.
Do I need separate strategies for AI search?
No — you need one strategy with the foundation done properly, plus answer-first formatting and consistent facts. Anyone selling you a completely separate AI-search discipline should have to explain what in it is not ordinary good publishing.
