GEO vs SEO vs AEO: what the letters mean for a small business

SEO (search engine optimization) means earning a place in search results. AEO (answer engine optimization) means being the direct answer to a question. GEO (generative engine optimization) means being used or named in an answer an AI model writes. For a small business they are one job with three goals, built on the same pages.

Why three names showed up at once

A roofer in Tulsa gets two emails in the same week. One offers "GEO services" for his website. The other says SEO is dead and he needs "AEO" now. Both are vague about what they would actually change on his site, and both cost more than his truck payment.

He is not the only one confused. In US Google autocomplete, people type "seo vs aeo vs geo full form", "geo vs seo vs aeo meaning" and "what is chatgpt seo called", which tells you the vocabulary is still settling. This page sorts it out, and then gets to the part that matters: what you would do differently on Monday.

The glossary

Term	Full form	Where it shows up	The goal	What you measure
SEO	Search engine optimization	Google and Bing results pages	Rank, get the click	Impressions, clicks, position in Search Console
AEO	Answer engine optimization	Featured snippets, voice assistants, AI answers	Be the direct answer	Whether your text is the one shown or read out
GEO	Generative engine optimization	ChatGPT, Gemini, Claude, Perplexity, Google AI Overviews and AI Mode	Be used or named in a written answer	Cited (linked as a source) and mentioned (named), counted separately
AIO, LLMO	AI optimization, large language model optimization	Same as GEO	Same as GEO	Same as GEO

SEO: the foundation nobody gets to skip

SEO is the work of making a site that search engines can crawl, understand and choose to show. Google's SEO starter guide covers the basics: pages Google can find, titles that describe the page, content written for people, and a site that works on a phone.

Nothing in the newer terms removes any of this. A page Google cannot index will not appear in AI Overviews either; Google's documentation on AI features says a page must be indexed and eligible to be shown with a snippet to appear as a supporting link.

AEO: the answer, not the list

AEO is the older of the two new labels. It grew up around featured snippets and voice assistants, where one answer is read out or shown above everything else, and it is now used for AI answers too.

The habit it teaches is useful: put a short, direct answer right under the question, then the details. If a customer asks "how long does a roof replacement take", the first lines of your page should say so, in days, with what changes the number.

GEO: being part of the written answer

GEO is the newest term. It comes from a 2023 research paper by Aggarwal and colleagues, "GEO: Generative Engine Optimization", which tested ways of changing a page's content and reported that some of them raised its visibility in generative engine answers by up to 40% in their benchmark. That was a lab setting, measured on their own test queries, not a promise for any site.

What GEO adds in practice is attention to the sources an AI model reads. Does the engine's crawler have access (OpenAI, for example, documents a separate crawler for ChatGPT search, OAI-SearchBot)? Is your business described the same way on your site, your Google Business Profile and the directories? Do other sites mention you? And are your answers specific enough to quote, with numbers, places and conditions?

It also changes what you count. In a written answer there is no position 3. You are either cited, mentioned, both, or absent, and it varies from run to run.

Where the three overlap, and where they really differ

Most of the work is shared. A clear page that answers a real question, on a site that loads fast and can be crawled, helps in all three.

The differences are real, though smaller than the sales emails suggest:

• The click. SEO is built around earning the visit. In AI answers the visit is less certain: Pew Research found that US users clicked a traditional result 8% of the time when Google showed an AI summary, against 15% without one. Being named in the answer has value even without the click.
• The overlap with rankings is partial. An Ahrefs study found that only 11.9% of the URLs cited by ChatGPT, Gemini and Copilot ranked in Google's top 10 for the same query. Ranking well helps; it is not the same thing.
• Mentions off your site matter in a new way. In classic SEO, links from other sites carry the weight. An AI model reads text as well as links, so a plain mention on a site it draws from may count for something even without a link. How much is not well measured yet.

What changes for a small business, in practice

Here is the honest list. It is shorter than you might expect.

1. Write for the question, not the keyword. A page titled "Roof replacement Tulsa" is SEO from ten years ago. A page titled "How long does a roof replacement take in Tulsa, and what slows it down" serves all three goals.
2. Answer in the first 40 to 60 words. Then add the details, the exceptions and the price range.
3. Check your robots.txt and firewall. Make sure Google and the AI search crawlers you care about are not blocked.
4. Make your business facts match everywhere. Name, address, phone, hours, services.
5. Measure two new numbers. Pick ten customer questions and test them in the answer engines once a month, noting cited and mentioned separately.

What does not change: Google Search Console is still your main source of truth about how people find you. Our Search Console guide for business owners walks through it.

One question, written three ways

Take a question the roofer hears every week: "can you replace a roof in winter in Tulsa?" (an illustrative example).

The old SEO version is a page called "Tulsa Roofing Services" with the words "winter roofing" repeated four times and no answer anywhere. It might rank for a while. It gives an answer engine nothing to use.

The AEO version puts the question in the heading and answers it underneath in two sentences: yes, on days warm enough for the shingles being used, and here is what usually causes delays. That is the text a featured snippet or a voice assistant can lift.

The GEO additions are about trust around that answer. The page links to the shingle maker's own installation guidance, states the service area and license number exactly as the Google Business Profile does, and the roofer is listed by a local trade association whose site an engine might also read.

It is one page and one afternoon of work, described with three labels. For more of the questions contractors get asked, see our page on the questions homeowners ask before hiring a contractor.

A note on the vendors

The new labels are useful for thinking, and also handy for selling. If someone pitches GEO as a separate product, ask them to show you which pages on your site they would write or change, and how they will measure the result. If the answer is a dashboard and no pages, you are buying measurement, not improvement. If they promise you will be recommended by ChatGPT, walk away: nobody controls those answers.

For the wider picture of what still works for a small site, see SEO for small business now that AI answers come first. If you are comparing tools, our dated price map of SEO and AI content tools lists what each one costs and includes.

How OrganicGrow uses these words

We start from the questions people ask in your field. Our free scan, with no card, reads your public site and shows which of those questions it already answers. For the questions you choose, the engine sends them itself to three answer engines (OpenAI, Google and Anthropic) through their official APIs and checks whether your business is cited or mentioned. How we count is on how we measure, and what we will not do is on what we don't do. Plans are on the pricing page.

Call it SEO, AEO or GEO. The next useful step is the same: pick the question you hear most and make sure your site answers it in the first paragraph.

Sources

• Aggarwal et al.: GEO: Generative Engine Optimization (arXiv, November 2023), checked November 2, 2026
• Google Search Central: AI features and your website, checked November 2, 2026
• Google Search Central: SEO starter guide, checked November 2, 2026
• OpenAI: overview of OpenAI crawlers, checked November 2, 2026
• Ahrefs: overlap between AI citations and Google rankings, checked October 30, 2026
• Pew Research Center: Google users are less likely to click on links when an AI summary appears (July 2025), checked October 30, 2026