Three disciplines, one goal
The goal of all three — SEO, AEO, and GEO — is the same: get your content in front of people who are looking for what you offer. What differs is the engine doing the delivering and the format of the result.
As AI-powered search becomes the dominant way people find information, understanding all three disciplines is no longer optional for marketers, content teams, and technical SEOs.
What is SEO?
Search Engine Optimization (SEO) is the practice of improving your website's visibility in traditional search engine results pages (SERPs) — primarily Google and Bing.
SEO focuses on keyword relevance, backlink authority, technical site health, Core Web Vitals, and on-page content quality. The output is a ranked list of ten blue links that a user clicks through to reach your site.
SEO remains the largest traffic channel for most websites, but its share of total search volume is declining as users shift to AI-generated answers that don't require clicking through to a source.
What is AEO?
Answer Engine Optimization (AEO) is the practice of structuring your content so that AI-powered answer engines — ChatGPT, Perplexity, Claude, Google AI Overviews — can extract, understand, and cite your brand in their responses.
AEO extends SEO by focusing on conversational query formats, direct-answer content structures, schema markup (especially FAQPage), and entity clarity. The output is not a ranked link but an inline citation or direct mention within an AI-generated answer.
Key AEO tactics: - Write content that directly answers specific questions at the start of sections. - Add FAQPage and HowTo schema to structured content. - Define your brand as an entity clearly in your About page and Organization schema. - Permit AI crawlers in your robots.txt.
What is GEO?
Generative Engine Optimization (GEO) is the practice of making your content authoritative, original, and structured enough to be incorporated into AI-generated summaries when users ask broad questions in your space.
GEO goes beyond AEO by focusing on the depth and originality of your content — original research, proprietary data, unique expert perspectives, and comprehensive coverage of topics. AI systems cite sources they trust, and that trust is built on E-E-A-T signals (Experience, Expertise, Authoritativeness, Trustworthiness).
Key GEO tactics: - Publish original research, surveys, and proprietary data. - Include clear author credentials and institutional affiliations. - Cover topics comprehensively with comparison tables, definitions, and FAQs. - Build topical authority by covering a domain deeply across many related articles.
SEO vs AEO vs GEO: Side-by-side comparison
| Dimension | SEO | AEO | GEO |
|---|---|---|---|
| Target engine | Google / Bing SERPs | ChatGPT, Perplexity, Claude | All AI answer engines |
| Output format | Ranked link list | Inline citation / answer | Generated summary with sources |
| Core signals | Keywords, backlinks, Core Web Vitals | Schema, FAQs, entity clarity | E-E-A-T, original research, depth |
| Content format | Keyword-optimized articles | Direct-answer Q&A, FAQs | Comprehensive guides, data, research |
| Technical focus | Page speed, crawlability, mobile | robots.txt AI permissions, JSON-LD | llms.txt, semantic HTML, HTTPS |
| Time horizon | Weeks to months | Days to weeks | Months (authority builds slowly) |
Which should you prioritize?
For most websites in 2025, the answer is: all three, in sequence.
Start with a strong SEO foundation — technical site health, crawlability, and core content quality underpin everything else. AEO and GEO optimization built on a technically broken site yields little.
Then layer AEO — add schema markup, update robots.txt, create an llms.txt, and restructure existing content around direct answers. These are high-impact, low-effort changes.
Finally, invest in GEO — build topical authority through original research, author-attributed content, and comprehensive coverage. This is the long game, but it compounds over time.
Auditly evaluates all three dimensions in a single audit. Run a free AI Readiness Audit to see where your site stands today.