SEO, AEO, GEO and AIO: The New Alphabet of AI Search
Part one of Found, Seen + Remembered, a five-part guide for entrepreneurs and business owners on being found in search, seen in AI answers and remembered by readers.
A couple of months after I finished a four-page website for a new product business I run the marketing for, a Gemini answer cited pages from it. I had searched for their product the way a buyer would.
The keywords they showed up for surprised me, and so did how quickly I found them. My read is that a Canadian reference in the metadata and in the page names did much of the work.
The site is now growing into guides and location pages that match the programs the business runs, so the work has shifted to protecting what is already showing up while the site gets larger. Three disciplines cover that work, and people use all three loosely. This is written for the owner of a product or service business whose buyers research online before they buy or hire. If your own site is live and you have not yet checked whether Google or AI tools name you, start here.
In short
What are SEO, AEO and GEO? SEO earns your pages a place in search results. AEO shapes your content so search tools can use it as the direct answer. GEO earns citations inside the responses AI tools write. Ranking and citation are separate results, so each needs its own check. A business owner needs all three, and the work for each builds on one foundation: pages that are clear and well structured, with a named author and sources a reader can check.
What Do SEO, AEO, GEO and AIO Mean?
Four terms circulate, and writers use them loosely. The working definitions below are the ones this series follows.
- SEO (search engine optimisation) earns a ranking in the list of results through relevant content, technical health and links from other sites.
- AEO (answer engine optimisation) shapes content so search tools and AI tools can use it as the direct answer to a question. Writers disagree on where AEO ends and GEO begins. HubSpot describes AEO as improving how often a business appears in AI-generated answers across ChatGPT, Gemini and Perplexity.
- GEO (generative engine optimisation) earns citations and mentions inside AI-generated responses. One HubSpot summary puts it briefly: AEO optimises for answers and GEO optimises for citations.
- AIO means AI optimisation in general and is also shorthand for Google's AI Overviews. Check which meaning an article uses before acting on its advice.
| Term | Goal | Where it shows up | What supports it |
|---|---|---|---|
| SEO | Rank in the results | Search results pages | Relevant content, technical health, links from other sites |
| AEO | Be the direct answer | Answer boxes, voice search and AI tools | Answer-first writing, clear headings, structured data |
| GEO | Be cited | ChatGPT, Gemini, Claude, Perplexity, Google AI Overviews | Named authors, original data, mentions across the web |
SEO remains the foundation, and AEO and GEO extend it. The four-page site I started with rested on that foundation. Metadata and page names are among the most basic SEO work there is, and the pages still turned up in a Gemini answer.
How Did Search Change from Ten Links to AI Answers?
Each step moved the answer closer to the reader and the website further from the first moment of contact.
| Year | Step |
|---|---|
| 1998 | Google launches, and ten blue links become the standard |
| 2011 | Siri brings spoken answers to the iPhone |
| 2014 | Featured snippets lift a single answer above the links |
| 2022 | ChatGPT launches in November |
| 2024 | Google launches AI Overviews in US search in May |
SEO, AEO and GEO are the three disciplines that grew up around those steps. The Gemini answer that cited the new business's pages sits at the far end of that list. That is the point where ranking and citation stop being the same result.
Ranking and Citation Are Separate Scorecards
Ranking and citation answer different questions, so each needs its own tracking.
Ahrefs analysed 15,000 prompts and found that, on average, 12% of the links cited by ChatGPT, Gemini and Copilot appear in Google's top 10 for the same prompt. Perplexity sat closest to Google, at 28.6%.
Google's own AI Overviews sit closer to the rankings. Earlier Ahrefs work found that 76% of the URLs cited in AI Overviews came from pages in the top 10. That is a reason to keep defending rankings while you work on citations, and it is why I look at both when I check the product business.
Search Console reports rankings. Citations show up when you ask ChatGPT, Gemini, Claude and Perplexity your clients' questions and read which sources each one names.
Four page signals appear repeatedly in practitioner research on AI citations and cost nothing to add: a named author with credentials, original data from your own work, a visible update date, and headings that match real questions.
What Does E-E-A-T Look Like on a Page?
Google describes four qualities in its guidance on people-first content, and each one appears on a page as something a reader can see.
- Experience: client stories with specific results and original photos from your own work.
- Expertise: an author bio with credentials, and first-person examples of the work you have done.
- Authoritativeness: features, mentions and credits from others in your field.
- Trustworthiness: cited sources for statistics, update dates, visible contact details and a named About page.
The four-page site fell short on authoritativeness. It borrowed some from a similar product the business distributes alongside its own, and the new site will add official credentials of its own.
A reader and a search system both look for the same evidence. A page that shows its author, its sources and its date gives both of them something to verify.
Zero-Click Search and Your First Impression
Picture a business owner asking ChatGPT for the best brand strategist in her city. It writes three sentences, names two firms and moves on. There is no results page and no click, so the first impression belongs to the firms named.
A zero-click search ends on the results page or in an AI answer, without a visit to any website. SparkToro found that 68% of US Google searches between January and April 2026 ended without a click. The same study reported AI Overviews appearing on more than 20% of searches. The 2026 figure uses a different data panel than SparkToro's 2024 study, so compare it with earlier years carefully.
A reader who finishes a search on the results page has already formed an impression of the businesses named there.
That is why the first paragraph of every piece you publish carries your point of view, and why I searched for the product the way a buyer would before I opened a single report.
Where Should You Start This Month?
- Ask the five questions. Put ChatGPT, Gemini, Claude and Perplexity the five questions your best clients ask before they hire you or buy from you, and note which sources each one cites.
- Check your rankings. Look up the same questions in Google Search Console.
- Add a named author bio with credentials to your most important pages.
- Rewrite the opening paragraph of each page so the answer comes first.
- Add an update date to each page and cite the source of every statistic.
- Repeat the check each month and record the results.
The four-page site gave me a baseline before the growth began. As the guides and location pages go live, I am checking what ranks and what Gemini cites, so the next search shows what the growth changed. Your site deserves the same baseline before anything on it changes.
Run one of your clients' questions through ChatGPT, Gemini, Claude and Perplexity and read which sources each one names. Part 2 of Found, Seen + Remembered, Where AI Tools Find the Experts They Recommend, follows those sources back to where they come from.
vein · Content intelligence
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1. Ahrefs: Only 12% of AI cited URLs rank in Google's top 10. 2. Ahrefs: Google AI Overviews, all you need to know. 3. SparkToro: In 2026, less than one third of Google searches still send a click. 4. Search Engine Land: Google zero-click searches hit 68% in early 2026. 5. Search Engine Land: Featured snippets introduced. 6. Google Search Central: Creating helpful, reliable, people-first content. 7. HubSpot: Introducing HubSpot AEO. 8. HubSpot: AEO vs. GEO. 9. upGrowth: LLM citation share.
Last reviewed October 2026.
