Generative engine optimization (GEO) is the practice of making your content more likely to be used and cited by generative AI engines when they answer a question. Those engines (ChatGPT, Perplexity, Gemini, Google's AI Overviews and AI Mode) don't return a list of links: they read several sources, write one answer and cite a few of them. GEO is about being one of those sources.
Where GEO comes from
The term was introduced in a 2023 research paper, GEO: Generative Engine Optimization, by Pranjal Aggarwal and colleagues, later accepted at KDD 2024. The authors built a benchmark of diverse user queries (GEO-bench) and tested how different changes to a source's content affected how visible it was in generative engine responses.
Their headline finding: GEO methods "can boost visibility by up to 40% in generative engine responses."
What the research found works (and what doesn't)
Three findings from the paper are directly useful for a business website:
- Evidence beats repetition. The top-performing methods were citing sources, adding quotations and adding statistics, which improved visibility by roughly 30-40% on the paper's main measure.
- Keyword stuffing doesn't work. Methods like keyword stuffing offered "little to no improvement" in generative engine responses.
- Smaller sites can gain the most. Lower-ranked websites "benefit significantly more from GEO." In the study, citing sources raised visibility by 115.1% for sites ranked fifth in search results, while the top-ranked site's visibility fell by 30.3% on average.
That last point matters for small service businesses. You don't need to be the biggest site in your market to be cited; you need content that's easier to trust and quote.
A caveat: this is one study on a research benchmark, run in 2023. Real AI assistants change constantly and don't publish how they choose sources. Treat these findings as direction, not a formula.
GEO vs. SEO vs. AEO
| SEO | AEO | GEO | |
|---|---|---|---|
| Goal | A position in ranked results | Be the direct answer | Be cited inside an AI-written answer |
| Where | Google, Bing results | Answer features, assistants | ChatGPT, Perplexity, Gemini, AI Overviews |
| Measured by | Rankings, impressions, clicks | Appearing as the answer | Mentions and citations in AI answers |
These aren't competing strategies. SEO is the foundation: Google states that to appear in its AI features, a page must be "indexed and eligible to be shown in Google Search with a snippet," with no additional requirements (Google Search Central). AEO and GEO then make your content easier to use as an answer and as a source. We cover AEO in detail in What is answer engine optimization.
What GEO looks like on a service business website
Translating the research into practical work:
- Back up your claims. Instead of "we're the best-rated clinic in town," cite the source: the review platform, the rating and the date. Instead of "fast service," state your actual response time or hours.
- Use specific numbers you can stand behind. Years in business, service area, number of locations, turnaround times, prices if you publish them. Never invent or round up.
- Quote real people when you can. A short quote from a client (with permission) or from your own expert explaining something is the kind of content the study found useful.
- Answer questions directly. Put the answer in the first lines of the page, then the detail.
- Be unambiguous about who you are. Same name, description, address and contact details on your site, your Google Business Profile and your other profiles.
- Make it readable by machines. Important content in the HTML, structured data that describes your business and services, and an llms.txt file summarizing what you do.
And what to avoid: keyword-stuffed pages, vague superlatives, and content written for an algorithm instead of a customer.
How to know if GEO is working
There's no Search Console for ChatGPT. The practical method:
- Write 10 to 15 questions the way your customers ask them, including your service and city.
- Ask them in ChatGPT, Perplexity, Gemini and Google.
- Record whether you're mentioned or cited, where, and which competitors and sources appear.
- Repeat monthly with the same questions and compare.
Paid trackers can automate this; we compared them in our guide to AI SEO tools.
The bottom line
GEO isn't a trick. The research points the same way good marketing always has: specific, evidenced, quotable content from a business that's clear about who it is. The difference is that now a machine is reading it first, and deciding whether to pass it on.
If you want to know where you stand today, our AI visibility audit asks your customers' real questions across four AI assistants and gives you a prioritized list of fixes.