SEO vs AEO vs GEO: what is the difference, and which do you need?
Three acronyms now describe how people find businesses online: SEO, AEO, and GEO. They sound like the same thing with different letters, and agencies often blur them. They are related, but they aim at different results.
The short version
| SEO | AEO | GEO | |
|---|---|---|---|
| Stands for | Search engine optimization | Answer engine optimization | Generative engine optimization |
| Where you show up | Google and Bing results, maps, shopping | Featured snippets, People Also Ask, voice assistants, AI Overviews | ChatGPT, Perplexity, Gemini, Claude, Copilot |
| What you win | A position in a list of links | The answer itself | A mention or citation in a written answer |
| How you measure it | Rankings, organic traffic, leads | Answer boxes won, question coverage | Share of tracked prompts that cite you |
SEO: be the link
Search engine optimization is the oldest of the three. It is about earning a position in the results people scroll through. The work covers technical health (speed, crawlability, site structure), content that matches what people search for, and links from sites people trust.
Google's own SEO Starter Guide is a good plain-language introduction. SEO is still the foundation for the other two.
AEO: be the answer
Answer engine optimization is about being the single, direct answer to a question. That might be a featured snippet at the top of Google, a People Also Ask box, a voice assistant reading out a reply, or an AI summary in search.
The work is to write short, sourced answers to the exact questions your buyers ask, then mark the page up so machines can read it. Structured data helps engines understand a page. Note that Google has limited when it shows FAQ rich results, so treat FAQ markup as a clarity aid, not a guarantee of a special listing.
GEO: be the source
Generative engine optimization is about being named and cited when an AI assistant writes an answer. Here there is often no page of links to rank on. The assistant picks a few sources and mentions them. GEO is about being one of those sources: easy to identify, easy to quote, and present on the sites the assistants trust. Our guide What is GEO? goes deeper.
Where they overlap
Most of the work is shared, which is why we plan the three as one project:
- Crawlable pages. Search bots and AI bots both need to reach and read your site. See how to let AI crawlers read your website.
- Clear, useful answers. A page that answers one question well can rank, win a snippet, and get cited.
- Trust signals. Accurate facts, named sources, and mentions on reputable sites help everywhere.
- Structured data. The same markup helps all three.
The differences are in emphasis and measurement. SEO is judged by positions. AEO is judged by answers won. GEO is judged by citations.
Which should you start with?
It depends on where your buyers look, but a sensible order for most businesses is:
- Fix the SEO foundation first. If your site is slow, hard to crawl, or thin on content, nothing else will work well.
- Add AEO as you publish. Write each new page so it opens with a short, direct answer. It costs little extra.
- Layer on GEO where buyers use AI. If your customers already research with ChatGPT or Perplexity, such as software, professional services, and higher-consideration purchases, start measuring citations early.
A local business that gets most customers from maps and "near me" searches will lean on SEO. A software company whose buyers ask AI assistants for recommendations will care about GEO sooner.
Common mistakes
- Treating GEO as a replacement for SEO. Google says its AI features use the same fundamentals as search. Drop SEO and you weaken GEO too.
- Chasing the acronym. Adding an "AI" label to old tactics is not a strategy. Fix what makes you hard to find and hard to trust.
- Expecting guarantees. Nobody controls what an AI assistant shows. Anyone promising a guaranteed mention is overselling.
- Not measuring. Without a fixed set of questions and regular checks, you cannot tell what is working.
Sources and further reading
- SEO Starter Guide (Google Search Central).
- Featured snippets and your website (Google Search Central).
- AI features and your website (Google Search Central).
- Introduction to structured data (Google Search Central).
- FAQPage structured data (Google Search Central).
- GEO: Generative Engine Optimization (arXiv).
Not sure where you stand on all three? Request a free audit call and we will check how you appear on Google, in answer boxes, and in AI assistants.