SEO vs AEO vs GEO

The three disciplines defined

SEO (Search Engine Optimization) optimises a website to rank in Google's search result lists. The goal is clicks: you rank for a keyword, users click through to your site. Success is measured in keyword rankings, organic traffic volume, and click-through rate. SEO is the oldest of the three disciplines and remains the foundation of digital visibility for most brands.

AEO (Answer Engine Optimization) optimises content so AI systems — ChatGPT, Google AI Overviews, Claude, Gemini, Perplexity — extract, trust, and cite it as a direct answer to user questions. The goal is citation, not clicks. A user reads an AI-generated answer that includes your content and leaves satisfied without visiting your site. Success is measured in citation frequency, how often your brand is mentioned, and AI visibility scores across multiple models.

GEO (Generative Engine Optimization) optimises content to be the trusted reference material large language models cite when synthesising answers. The goal is being the source — having your original research, data, or authoritative guides become the material AI systems trust and reference. Success is measured in LLM recommendation rate and whether AI systems cite you as an authoritative source in their outputs.

Key differences: a quick comparison

Target system: SEO targets Google's ranking algorithm. AEO and GEO both target AI systems, but at different layers — AEO optimises how content is extracted for answers, GEO optimises what content is worth citing.

Content format: SEO favours long-form articles optimised for keyword searches. AEO favours direct-answer content, FAQs, and structured data. GEO favours original research, proprietary data, and authoritative comparison guides.

Speed of results: SEO takes months to years. AEO and GEO produce measurable results in weeks to months.

Brand size bias: SEO is heavily biased toward established authority. AEO and GEO reward content quality and originality regardless of domain age.

Where AEO and GEO overlap — and where they differ

AEO and GEO are frequently used interchangeably. They are not the same thing, but they overlap significantly.

AEO focuses on structure — how content is formatted, tagged, and presented so AI systems can extract clean answers. The question is: can AI pull a clean, citable answer from this page?

GEO focuses on substance — what content exists that's worth citing. The question is: is there something original, researched, or authoritative here that AI would want to reference?

The most effective strategy combines both: original content worth citing (GEO) structured so AI can extract it cleanly (AEO), on a technical foundation that makes it retrievable at all.

Does AEO replace SEO?

No. SEO, AEO and GEO are complementary, not competing. Nearly 40% of Google AI Overviews cite pages from top-10 organic search results — so strong SEO foundations support AI visibility. However, a site can rank well in traditional search and be completely absent from AI-generated answers, and vice versa. The disciplines require different content formats, different success metrics, and different technical setups.

Which one does your brand need?

Most brands need all three at different priority levels:

Focus on SEO if: Most of your traffic comes from Google search, your customers search for products before buying, you have weak domain authority or few backlinks, or your content is not yet indexed or ranked.

Focus on AEO if: Your brand doesn't appear in Google AI Overviews, competitors are being recommended by ChatGPT but not you, you score low on an AI visibility checker, or your website has no FAQ schema or structured data.

Focus on GEO if: You have original research or proprietary data, your category has sparse low-quality AI training data, you want to establish a new category or concept, or you want to build long-term AI entity authority.

Frequently asked questions