SEO vs AEO vs GEO: What's the Difference and Which Does Your Business Need?

Short answer: SEO (Search Engine Optimization) helps your pages rank in search results. AEO (Answer Engine Optimization) helps your content get quoted as the direct answer. GEO (Generative Engine Optimization) helps AI assistants mention and cite your brand when they generate answers. They are three layers of the same strategy — and SEO is the foundation the other two stand on.

Search used to mean a list of ten blue links. Today, a single question can return a featured snippet, a "People also ask" box, a Google AI Overview, a map pack and video results — and many people skip the results page entirely and ask ChatGPT, Gemini or Perplexity instead. Each of these surfaces rewards slightly different things, which is why the new acronyms exist.

This guide explains what each one means, how they relate, and how to decide where your business should start.

What is SEO?

SEO is the practice of improving a website so search engines can crawl it, index it and rank it for the searches your customers make. It has three broad parts:

1. Technical SEO — making sure pages can be discovered, rendered and indexed, load quickly on mobile, and are organised in a sensible structure.
2. On-page SEO and content — matching each page to a clear search intent, with descriptive titles and headings and content that fully answers the query.
3. Off-page SEO — earning links, mentions and reviews that show other people trust you.

Google summarises its expectations in Search Essentials: technical requirements, spam policies and best practices. Everything else in this article builds on getting these right.

What success looks like: your important pages are indexed, rank for relevant searches, and bring in visitors who convert into enquiries or sales. Our SEO services focus on exactly this foundation.

What is AEO?

AEO is the practice of structuring content so that search engines and voice assistants can extract it as a direct answer. Instead of only listing your page as a link, the search engine quotes a passage from it — in a featured snippet, a "People also ask" answer or a spoken reply from a voice assistant.

Good AEO content has a recognisable shape:

• A heading that mirrors the question ("How long does SEO take?").
• A direct answer in the first one or two sentences beneath it.
• Supporting detail, examples, steps or a table after the answer.
• A format that suits the query — a paragraph for "what is", a numbered list for "how to", a table for comparisons.

Google's documentation on featured snippets is explicit that snippets are selected automatically and cannot be requested with markup. AEO therefore is not a trick; it is clear writing and clear structure, applied to the questions your customers actually ask. We cover the method in detail in our guide to Answer Engine Optimization.

What success looks like: your brand is the quoted answer for important questions in your category, even when the searcher never clicks.

What is GEO?

GEO is the practice of improving how generative AI systems — ChatGPT, Gemini, Perplexity, Microsoft Copilot and Google's AI Overviews and AI Mode — understand, describe and cite your brand.

These systems produce answers in two broad ways. Some draw on what a model learned during training. Others retrieve web pages at the moment of the question and summarise them, often with links to sources. Either way, the brands that appear tend to be the ones described clearly and consistently across many trustworthy sources.

GEO work typically includes:

• Testing a defined set of prompts across AI assistants to see whether and how your brand appears.
• Fixing inconsistent information about your company across your website, profiles and directories.
• Publishing content that is genuinely worth citing: clear definitions, original insight, comparisons and expert explanations.
• Earning mentions on the publications, review sites and communities that AI answers cite in your category.
• Making sure important pages are technically accessible to the crawlers these systems use.

Google's guidance on AI features and your website states that the same SEO best practices apply to its AI features and that there are no additional special requirements to appear in them. That is an important point: GEO is not a separate universe — it is SEO and content quality, extended to a new kind of answer.

What success looks like: when buyers ask an AI assistant for options in your category, your brand is mentioned and described accurately. Our Generative Engine Optimization service is built around measuring and improving this over time.

How do SEO, AEO and GEO compare?

Why are they layers, not alternatives?

Each layer depends on the one beneath it:

• A page cannot be quoted as an answer (AEO) if it is not indexed and trusted (SEO).
• AI systems that retrieve live content can only cite pages they can access and understand (SEO), and they favour passages that answer clearly (AEO).
• Authority signals that help you rank — links, mentions, reviews — are also part of what makes a brand familiar to AI systems (GEO).

This is why we plan the three together. Treating them as separate projects often leads to duplicated work, or to "AI optimisation" being layered on top of a site that search engines cannot properly crawl.

Which one does your business need first?

For most businesses the order is the same, but the emphasis differs.

Start with SEO if…

• Important pages are missing from Google's index or load slowly on mobile.
• You do not rank for the core searches that describe your product or service.
• You have recently redesigned or migrated your website.

Prioritise AEO if…

• You already rank on page one for many queries but rarely own the snippet.
• Your customers ask many "what", "how", "how much" and "which is better" questions.
• You have FAQ, help or glossary content that is long but poorly structured.

Invest in GEO if…

• Prospects tell you they found competitors through ChatGPT or Perplexity.
• AI assistants describe your company inaccurately, or not at all.
• You operate in a crowded category where buyers rely on shortlists.

A practical 90-day starting plan

1. Weeks 1–3: audit. Check indexing in Google Search Console, page speed on mobile, site structure and the top queries you already appear for. If you would like a second opinion, request a free SEO audit.
2. Weeks 3–6: fix the foundation. Resolve indexing and technical issues, consolidate duplicate pages, and make sure each priority page targets one clear intent.
3. Weeks 6–9: restructure answers. Rewrite your most valuable pages so each key question has a direct answer under a descriptive heading, and add accurate structured data for visible content.
4. Weeks 9–12: benchmark AI visibility. Agree a list of prompts that matter to your pipeline, record how AI assistants answer them today, and plan content and mentions to close the gaps.

What should you be wary of?

Be cautious of anyone who guarantees rankings, featured snippets or AI mentions. Search engines and AI assistants are run by third parties, change frequently and answer differently from one day — and one model — to the next. A credible approach focuses on the signals these systems are documented to use, measures trends over time, and reports honestly when something does not work.

The bottom line

SEO, AEO and GEO are not competing strategies. SEO makes you findable, AEO makes you the answer, and GEO makes you part of the conversation when buyers ask AI for advice. Start with the foundation, structure your expertise clearly, and then measure how AI systems see you.