SEO vs AEO vs GEO: What's the Difference?
A clear comparison of SEO, AEO and GEO — what each one optimises for, where each shows up, and how they work together in a modern digital marketing strategy.
SEO, AEO and GEO are three related but distinct approaches to search visibility: SEO optimises for ranking in traditional search results, AEO optimises for being used as a direct answer, and GEO optimises for being understood and cited by generative AI tools. They overlap, but they aren't interchangeable — and understanding the difference helps decide where to actually spend effort.
The three, defined
SEO — Search Engine Optimization
SEO is the practice of improving a website so it ranks more prominently in organic search results for relevant queries. It covers keyword research, on-page structure, technical health (speed, crawlability, mobile-friendliness) and backlinks. SEO's unit of success is position in a results page.
AEO — Answer Engine Optimization
AEO is the practice of structuring specific content — a paragraph, a definition, a list — so it can be extracted and shown directly as an answer, in a featured snippet, an AI Overview, or a voice response. AEO's unit of success is being the quoted or spoken answer, not just a ranked link.
GEO — Generative Engine Optimization
GEO is the practice of making a brand's information — who it is, what it does, where it operates — clear and consistent enough for generative AI tools like ChatGPT, Gemini and Perplexity to understand and cite it accurately when summarising an answer that draws on multiple sources.
Side-by-side comparison
| SEO | AEO | GEO | |
|---|---|---|---|
| Optimises for | Ranking algorithms | Direct, extractable answers | Accurate understanding & citation |
| Shows up in | Google, Bing results pages | Snippets, AI Overviews, voice | ChatGPT, Gemini, Perplexity, Copilot |
| Unit of success | Ranking position | Being quoted as the answer | Being cited or referenced accurately |
| Core technique | Keywords, structure, technical SEO | Answer-first writing, Q&A structure | Consistent entity info, structured data |
How they build on each other
These aren't three separate strategies to choose between — they're layered. A page needs solid SEO to be found and crawled at all. AEO then structures the content on that page so specific passages can be lifted as direct answers. GEO extends that same clarity and consistency across the whole site and its structured data, so a generative AI model summarising several sources has an accurate, well-supported picture of the brand to draw on.
A simple way to think about it
- SEO gets you into the conversation.
- AEO gets you quoted directly.
- GEO gets you described accurately by an AI that's talking about your topic, even when it isn't quoting a single page.
FAQs
Do I need to choose between SEO, AEO and GEO?
No — they're complementary layers rather than competing strategies. Most content benefits from all three applied together.
Which one should a small business prioritise first?
SEO fundamentals first, since AEO and GEO both depend on a site being crawlable and well-structured to begin with.
Can a small website realistically do all three?
Yes — none of the three requires large budgets. They require clear writing, sensible structure and consistency, which are achievable at any site size.
Related reading: What Is AEO? A Beginner's Guide, the SEO page and the GEO page.