The short answer
- SEO optimizes the ranked list of links on a results page. Thirty years old, foundational, still mandatory.
- AEO (Answer Engine Optimization) predates generative AI â it originally described optimizing for featured snippets and voice assistants, the first mainstream "one answer" interfaces.
- GEO (Generative Engine Optimization) was formally named by a 2023 academic paper, targeting generative engines â AI systems that retrieve, synthesize and cite.
- In 2026 practice, AEO and GEO describe essentially the same work; SEO relates to both as foundation to floors, not as a rival.
Where each term comes from
SEO: three decades of discipline
Search Engine Optimization built a mature industry around "rank higher, win the click" â keyword research, link building, technical audits. None of that is obsolete; it just stopped being the whole story.
AEO: born in the featured-snippet era
The term became popular before ChatGPT, describing optimization for Google featured snippets and voice assistants (Alexa, Siri). When generative AI took over the "one answer" interface, the word carried over naturally.
GEO: named by academia, 2023
Researchers from Princeton and other institutions defined the term in GEO: Generative Engine Optimization (published at KDD 2024), studying generative engines â AI answer systems that search the web, synthesize sources and cite them. The paper also shipped a measurable benchmark (GEO-bench), making "visibility inside AI answers" something you can quantify.
What genuinely differs
- The object being optimized: SEO shapes a list of links; AEO/GEO shape the answer text itself.
- Success metrics: SEO counts rankings, click-through and organic traffic; GEO counts mentions, recommendation rank and citations â and, further out, sentiment.
- Stability: search rankings are comparatively stable and compounding; AI answers are volatile â in a University of St. Gallen study (April 2026), across ~3,000 runs of comparable prompts, the odds of seeing the same brand-recommendation list twice were under 1%. GEO measurement therefore has to be continuous sampling, never a one-off screenshot.
- Where the click goes: SEO ends with a visit to your site; in GEO, many answers are zero-click â the brand impression happens inside the answer itself.
The words we use
In English we lead with GEO and co-tag AEO â both audiences are real, and both are searching. In Chinese we run three terms side by side: GEO / įæåŧåŧæäŧå / AI å¯č§åēĻ â the last needs no explanation, the first is the practitioners' standard.
Practical advice
Don't fight over labels. All three share one white-hat foundation: crawlable, structured, authoritative, measurable. Budget order: fix the SEO foundation first (AI retrieval depends on it), then add the GEO layer â llms.txt, answer-shaped content, third-party sources, continuous monitoring. Start with What is GEO.