The short answer
SEO (Search Engine Optimization) aims to rank your page in search results. AEO (Answer Engine Optimization) aims to be the direct answer in features like Google's AI Overviews and voice assistants. GEO (Generative Engine Optimization) aims to get your brand cited inside AI chat answers from ChatGPT, Claude, Perplexity and Gemini. They overlap, but optimizing for one does not guarantee the others — in 2026 you need all three, with GEO the fastest-growing.
The one-line definitions
| Term | Optimizes for | Where it shows up |
|---|---|---|
| SEO | Ranking a page | Google/Bing blue links |
| AEO | Being the answer | AI Overviews, featured snippets, voice |
| GEO | Being cited by AI | ChatGPT, Claude, Perplexity, Gemini answers |
Why they're not the same
It's tempting to think "good SEO covers all of it." It doesn't. Google rank is a poor predictor of AI citations — a large share of ChatGPT-cited pages don't rank in Google's top results. And the engines diverge from each other: ChatGPT and Perplexity share only around 11% of their cited domains. So you can rank #1 on Google and still be invisible when a buyer asks ChatGPT for a recommendation.
Where the work overlaps
The good news: the foundational work serves all three. Do these and you improve across SEO, AEO and GEO at once:
- Answer-first content — a clear, self-contained answer near the top of the page.
- Structured data — schema (FAQPage, Organization, Product) so machines parse you.
- Authority — being mentioned and reviewed on the third-party sources engines trust.
- Crawlability — letting search and AI crawlers in, and publishing an llms.txt.
SEO
the blue links
AEO
AI Overviews & snippets
GEO
ChatGPT / Perplexity answers
How they build on each other
Think of them as layers, not rivals. Solid SEO makes your pages crawlable and authoritative. AEO shapes those pages into direct answers. GEO earns you a place in the sources AI synthesises from. Each layer makes the next easier — which is why the fundamentals below serve all three.
- 1
Foundation — be readable
Clean, crawlable pages, allowed to search and AI crawlers. Without this, nothing else lands.
- 2
Structure — be the answer
Front-loaded answers and schema so machines can extract you as a clean passage.
- 3
Authority — be trusted
Reviews, roundups, directories and mentions on the sources engines already cite.
Where to spend your effort in 2026
The short version
Keep doing SEO — it still drives traffic. But GEO is where the growth and the gap are: buyers are moving to AI faster than brands are optimizing for it. Measure your AI citations, not just your rankings.
See where AI sends your buyers.
Run a free scan across 16 AI engines — get your score, who's recommended instead, and the exact fixes. £1 for 24 hours.
Check my AI visibility →