SEO vs AEO vs GEO: What's the Difference?
SEO, AEO and GEO overlap heavily. Here is what each term means, where they genuinely differ, and why the fundamentals are shared.
Three acronyms now compete for attention: SEO (search engine optimization), AEO (answer engine optimization) and GEO (generative engine optimization). Vendors sometimes present them as separate disciplines requiring separate budgets. In practice they overlap heavily. This article separates the real differences from the marketing.
Definitions
- SEO: improving a site so search engines can crawl, index, understand and rank it, and so users who find it are satisfied.
- AEO: structuring content so search features, voice assistants and AI systems can extract a clear answer and attribute it.
- GEO: a term popularised by a 2023 research paper, "GEO: Generative Engine Optimization", for improving visibility in generative AI answers.
Side-by-side comparison
| SEO | AEO | GEO | |
|---|---|---|---|
| Primary target | Ranked links | Direct answers: snippets, voice, AI | Generative AI responses with citations |
| Core tactics | Relevance, technical health, links, quality content | Answer-first writing, structure, authorship, trust | Specific, well-sourced, quotable content |
| Success signals | Rankings, clicks, conversions | Rankings plus answer features | Mentions and citations (hard to measure) |
| Evidence base | Mature, documented by search engines | Mature for snippets; evolving for AI | Early research, experimentation |
| Maturity | Established | Established / evolving | Early |
What they share
- Pages must be crawlable and indexed. Retrieval-based AI systems still depend on an index.
- Content must be helpful and accurate.
- Trust signals matter: authorship, sources, reputation.
- Structured data helps interpretation but guarantees nothing.
- Measurement relies on Search Console and your own analytics.
Google's guidance on AI features says the same foundational SEO practices apply and no special optimisation is required.
Where they genuinely differ
- The unit of success. SEO's unit is the ranked page. AEO and GEO care about the passage or fact extracted from a page.
- Writing style. Answer-first structure, definitions and specific numbers matter more when a system might quote a passage on its own.
- Measurement difficulty. Rankings are measurable. AI mentions vary by prompt, user, time and model, so any score is a sample.
- Time horizon. AI products change quickly. Tactics tied to one product's behaviour age fast.
What the research on GEO found, and its limits
The original GEO paper tested content changes on a benchmark and reported that adding quotations, statistics and source citations improved visibility in its test setting, while keyword stuffing did not. These results come from a specific experimental setup and do not guarantee outcomes on real sites. They are consistent with a boring conclusion: specific, well-sourced, clear content helps.
What to prioritise
| If your site has… | Prioritise |
|---|---|
| Crawl or indexing problems | SEO fundamentals first |
| Good pages with vague writing | Answer-first rewrites (AEO) |
| Little third-party coverage | Earning mentions and links |
| No authorship or dates | Trust signals |
| A solid base | AEO measurement and refinement |
Common mistakes
- Buying "GEO" as separate from SEO.
- Believing lists of AI "ranking factors": none are published.
- Abandoning SEO because AI answers exist.
- Optimising for one product's quirks.
A decision guide: which "O" do you need today?
| Your situation | Do this first |
|---|---|
| New site, few pages indexed | SEO fundamentals: crawl, index, core pages |
| Established site, traffic flat | Content depth and intent matching (SEO) |
| Good rankings but vague pages | Answer-first rewrites (AEO) |
| Strong brand, rarely cited in AI answers | Third-party mentions, consistency, authorship (AEO/GEO) |
| Running experiments in AI products | A fixed question set and dated spot checks (GEO) |
Most sites are in the first two rows. Fix those before worrying about the last.
How vendors use the acronyms
You will see "GEO", "AEO", "LLMO", "AI SEO" and more used loosely. Ask any vendor three things: what exactly will you change on my site, how will you measure it, and what will you not promise? If they promise guaranteed citations, walk away.
Metrics by discipline
| Discipline | Primary metrics | Caveats |
|---|---|---|
| SEO | Rankings, impressions, clicks, conversions | Position varies by location and device |
| AEO | Snippet and answer-feature wins, readiness scores | Scores from tools are heuristics |
| GEO | Mentions and citations in sampled AI answers | Small samples; answers vary |
A note on budgets
Do not fund a separate "GEO programme" until your SEO and content basics are strong. The same editorial standards and technical health feed all three. Spend on fixing and improving pages, original research and credible mentions.
FAQs
Do I need three strategies? No. One strategy: helpful, clear, crawlable, credible content, measured sensibly.
Is GEO real? The term and research are real; reliable, product-independent tactics are still limited.
Which should I do first? SEO fundamentals, then answer-first improvements.
Next steps
Read the answer engine optimization guide and generative engine optimization, and check your own site with the AEO analysis tool.
Sources
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