Search has split into three surfaces. You need a play for each one.
Five years ago, "showing up in search" meant ranking on Google. Today it means three different things at once: ranking on Google, winning answer boxes and AI Overviews, and being cited inside generative AI conversations.
The three disciplines — SEO, AEO, and GEO — overlap heavily in fundamentals but diverge in tactics. Here's the full stack.
What the three-layer stack is
Think of it like this:
- SEO wins the traditional results page — ten blue links, map pack, image carousels.
- AEO (Answer Engine Optimisation) wins the direct answer surfaces — featured snippets, knowledge panels, voice search responses, and Google's AI Overviews.
- GEO (Generative Engine Optimisation) wins citations and mentions inside generative AI chat — ChatGPT, Perplexity, Gemini, Claude.
Each layer has its own success criteria. Most importantly, each layer has its own user. The person clicking organic listings, the person asking voice search, and the person chatting with an AI are at different points in the funnel — and they convert differently.
Layer 1: SEO — still the foundation
SEO isn't dead. It's the underlying signal for the other two layers.
AI models learn from the same web Google crawls. Schema markup, internal linking, page speed, and authoritative backlinks all feed into how AI evaluates your site. If your SEO foundation is weak, AEO and GEO are uphill.
The 2026 SEO essentials haven't changed much:
- Technical hygiene — fast pages, crawlable architecture, clean Core Web Vitals.
- Keyword research aligned to actual buyer questions.
- Topic clusters that demonstrate category depth.
- Authoritative backlinks from credible domains.
Layer 2: AEO — winning the answer surfaces
AEO optimises for the moment when Google (or another engine) extracts a direct answer from your page and shows it above the blue links. Featured snippets, People Also Ask, AI Overviews, knowledge panels, voice results.
Tactics that consistently win AEO:
- Question-shaped H2s. Match the exact phrasing of the query you're answering.
- 40–60 word answer paragraphs. Featured snippets are typically pulled from concise, direct paragraphs near the question.
- Numbered and bulleted lists. Snippet boxes for procedural queries are usually pulled from lists.
- Schema markup. FAQPage, HowTo, and Article schema all increase the odds of being pulled.
AEO is the layer most undervalued. Featured snippet wins are typically zero-click — but they put your brand name above the fold for thousands of queries. That impression compounds.
Layer 3: GEO — winning citations in AI chat
GEO is the newest layer and the one most marketers haven't built a play for. The win condition: your brand is mentioned, by name, when a user asks a generative AI about your category.
The mechanics differ from SEO and AEO. GEO depends less on ranking and more on:
- Training-data presence — how often your brand appears across the web alongside topical context.
- Quotable content — sentences and stats that AI can extract and attribute.
- Third-party signal — Reddit, Wikipedia, industry publications, podcasts.
- Retrieval-friendliness — semantic clarity, clear structure, and accessible HTML.
Side-by-side: what wins each layer
| Layer | What wins | Primary metric |
|---|---|---|
| SEO | Authoritative content + technical hygiene + backlinks | Rank position, organic clicks |
| AEO | Concise answers + schema + question-shaped headings | Featured snippet count, voice mentions |
| GEO | Quotable claims + third-party signal + retrieval-friendly structure | AI citation rate, AI referral traffic |
Which to prioritise first
Most teams should build in this order:
- SEO first — without the foundation, the other layers don't work. Get technical hygiene, topic clusters, and authority signals in place.
- AEO second — quick wins. Restructuring existing top-ranking pages with question-shaped headings, concise answers, and schema can capture multiple snippet positions inside a quarter.
- GEO third — the longest payoff. Start measuring citations now, build the third-party signal surface, and adapt your content style. This is the 2026 differentiator.
All three layers feed into each other. A page optimised for SEO can be lightly adapted for AEO. The same page, with the right structural tweaks, becomes a citation candidate for GEO. Build them together, not in isolation.