Short answer
SEO is the work of being found and chosen in search results, AEO is making your page the direct answer (snippets, voice, AI summaries), and GEO is getting cited or mentioned in answers that generative AI writes. They overlap heavily and all rest on crawlable, helpful, trustworthy pages. For a small business, a solid SEO base plus clear, specific answers covers all three.
How do SEO, AEO and GEO compare at a glance?
| SEO | AEO | GEO | |
|---|---|---|---|
| Full name | Search engine optimization | Answer engine optimization | Generative engine optimization |
| Goal | Be found and chosen in search results | Be the direct answer in a snippet, a voice reply or an AI summary | Be cited or mentioned in answers that generative AI writes |
| Where it shows up | Ordinary results, maps and local listings | Featured snippets, People also ask, voice assistants, AI answers | ChatGPT, Google AI Overviews and AI Mode, Perplexity, Claude, Copilot |
| Main levers | Crawlability, relevance, links, page experience, trust | Question headings, a short direct answer first, specific facts | Sourced facts and statistics, original information, mentions elsewhere, access for AI crawlers |
| Success looks like | Rankings, clicks and enquiries | Owning the snippet or being the answer that is read out | How often you are cited or mentioned across many test questions |
| How settled it is | Decades of practice | Older ideas under a newer label | Newest term, evidence still unsettled |
Do they really overlap?
Yes, a lot. All three need a page that search systems can crawl, index and understand, and all three reward pages that are helpful, accurate and written by someone who knows the subject. Google's May 2026 guide to generative AI features says AI Overviews and AI Mode run on its core Search ranking systems and that the same SEO fundamentals apply. It also says no special markup, llms.txt file or chunking is required.
The three terms were coined by different people at different times, and agencies use them loosely. Some use AEO to mean everything, others use GEO. The label matters less than the work: if a vendor cannot say exactly what they would change on your pages and how they would measure it, the label is marketing.
Where do they genuinely differ?
- Format. AEO cares most about how a page is laid out: a question heading, then the answer in the first sentence or two. See what AEO is.
- Evidence and reputation. GEO adds attention to facts that can be checked and to what the wider web says about you. The 2024 Princeton GEO research found that adding statistics and cited sources helped most and keyword stuffing helped least.
- Access. GEO also asks whether AI crawlers, such as OAI-SearchBot for ChatGPT search, are allowed in, not only Googlebot.
- Measurement. SEO measures rank and clicks. AEO and GEO measure whether you are the source inside an answer, which is noisier because answers vary by run and by person.
What should a small business actually do?
- Fix the basics first
Make sure your key pages are indexed in Google, load quickly on a phone and have clear titles. Ahrefs found that about 76% of pages cited in Google's AI Overviews ranked in the top ten, so ordinary ranking is a strong head start.
- Answer the customer's question at the top of each key page
Use the question as a heading and answer it in the first sentences, with real specifics: price ranges, areas served, hours, timeframes.
- Let the crawlers in
Check robots.txt and any bot protection from your host. Blocking OAI-SearchBot keeps you out of ChatGPT search. See allowing or blocking AI crawlers.
- Build mentions beyond your own site
Claim your Google Business Profile, collect honest reviews, and appear in the directories and local press that matter in your trade.
- Check by asking
Put the questions your customers ask to ChatGPT, Google and Perplexity on different days, and note whether you appear. Repeat monthly.
- Skip the hype
Do not expect an llms.txt file or markup tricks to change results. Google says it does not use llms.txt, and Ahrefs found 97% of such files received zero requests in May 2026.
For a fuller plan, see SEO for small business and a practical plan for 2027.
Which one comes first if you can only do one?
Start with SEO, because the other two stand on it. Then spend your effort on clarity: the direct answer first, specific facts and a visible date. That one habit serves SEO, AEO and GEO at once. Add the GEO-style extras, such as reputation work and checking AI answers, once the basics are in place. If your customers already ask assistants for recommendations in your trade, move those extras up the list.