SEO vs GEO: what they are, how they differ, and why both matter in 2025
Search has split into two distinct channels. There is the traditional search engine results page, where rankings and organic clicks remain very much alive, and there is a newer, fast-growing channel where AI assistants answer questions directly, citing sources they judge to be authoritative. Optimising for the first is SEO. Optimising for the second is GEO. They share foundations but require different thinking, and businesses that treat them as the same thing tend to underperform in both.
What is SEO?
Search engine optimisation is the practice of improving a website’s visibility in traditional search engines, principally Google, so that pages rank higher and attract more organic traffic. It spans technical infrastructure, on-page content quality, and off-site authority signals. A well-optimised site is fast, crawlable, structured clearly, and has earned links and mentions from credible external sources. The measure of success is rankings and the clicks that follow from them.
What is GEO?
Generative engine optimisation is the practice of making a business citable and trustworthy in AI-generated answers, across tools such as ChatGPT, Google AI Overviews, Perplexity, and Claude. Where SEO asks whether a search engine can rank a page, GEO asks whether an AI would trust a source enough to reference it. A brand mentioned frequently across reputable third-party sources may appear in AI answers even when its own website is not particularly strong technically. Equally, a page can rank well in Google while never appearing in an AI Overview. They are related disciplines but they are not the same.
Where do they overlap?
Both disciplines benefit from the same underlying foundation. Strong E-E-A-T signals, meaning demonstrated experience, expertise, authoritativeness, and trustworthiness, support both traditional rankings and AI citation. Technical hygiene matters in both. Structured, factual, well-written content performs better in both channels than thin or keyword-stuffed copy. Businesses that have invested seriously in SEO over time tend to have a head start in GEO, but there is additional work to do, and the signals are weighted differently.
Frequently asked questions
Do I need GEO if I already invest in SEO?
Yes, if visibility in AI tools matters to you. The audiences overlap but are not identical. Someone asking ChatGPT for a recommendation operates differently from someone typing a query into Google. Businesses that focus only on traditional rankings are increasingly absent from the channel where high-intent research is moving.
Does GEO replace SEO?
No. Traditional search still drives significant traffic and is likely to do so for years. GEO should be treated as an additional layer of optimisation, not a replacement. Most of the technical and content groundwork for good SEO also supports GEO, so the investment is complementary rather than competing.
Which AI platforms should I optimise for?
The priority depends on your audience, but the main ones to consider are Google AI Overviews, ChatGPT with browsing enabled, Perplexity, Microsoft Copilot, and Claude. Each draws on different data sources and weights trust signals slightly differently, though the fundamentals of being a credible, well-structured, widely cited source apply across all of them.
How do AI models decide which sources to cite?
There is no single published algorithm, but the consistent signals are topical authority, third-party validation, entity clarity, and content structure. An AI needs to be able to identify what your business does, find credible external sources that reference you, and extract clear factual claims from your content. Schema markup, consistent business information, and well-organised factual writing all contribute.
My website is small. Can I still appear in AI answers?
Size is less important than relevance and credibility. A well-structured, clearly written website in a specific niche, with strong third-party mentions and substantive factual content, can outperform a much larger competitor in AI citation. The quality of what you publish and who references you matters more than domain size or page count.
How do I measure GEO performance?
The discipline is still maturing and dedicated tooling is limited. A practical approach combines manually querying AI platforms for relevant questions in your category to see whether your brand appears, monitoring branded mentions and citations across online publications, and tracking Google AI Overview appearances via Search Console and third-party rank trackers that have added AI Overview coverage.
Is GEO only relevant for consumer-facing businesses?
Not at all. B2B buyers increasingly use AI tools in the early stages of research, particularly for technical or specialist purchases. If your prospective customers ask an AI assistant about suppliers, solutions, or vendors in your category, being citable in those answers carries real commercial value regardless of whether you sell to businesses or consumers.