SEO, AEO, GEO, AIO: The Acronym Soup Explained on One Page for Business Owners

SEO gets your website found in search results. AEO gets your answer chosen when someone asks a direct question. GEO gets your business cited by generative AI such as ChatGPT, Gemini, Perplexity and Google's AI Overviews. AIO is a looser label for optimising for AI in general. They sound like four separate jobs. They aren't. They're layers of one full search stack.

If you've had an agency pitch you GEO this month and AEO last month, this page is for you. Here's what each term means, what it changes for your business, and what to do about it.

Why the acronyms multiplied

For twenty years, search meant typing words into Google and clicking a blue link. That's no longer the only way buyers look for suppliers. Google now answers many questions directly in the results, AI assistants write summaries with a handful of sources, and AI agents can research and shortlist on a buyer's behalf.

The shift is real. In G2's 2026 Buyer Behavior Report, 51% of B2B software buyers said they now start their research with an AI chatbot more often than with Google, up from 29% a year earlier. Each new way of searching picked up its own acronym, and the industry has been selling them one at a time ever since.

One page, four acronyms (plus one)

SEO: the foundation

Search engine optimisation is still the base layer. If your pages aren't indexed, fast and trusted by search engines, nothing above it works, because AI tools draw heavily on the same web that search engines crawl. Google's own guidance for its AI features says there are no extra technical requirements to appear in AI Overviews or AI Mode: the page simply has to be indexed and eligible to show in Search.

AEO: being the answer

Answer engine optimisation is about being the response, not just a result. It grew up around featured snippets and voice search, and it matters more now that answers appear before the links. In practice it means writing pages that state the question a buyer asks and answer it in the first line or two, then give the detail.

GEO: being the source AI quotes

Generative engine optimisation comes from a 2024 research paper by teams at Princeton and IIT Delhi, presented at the KDD conference. The researchers tested what makes content more visible in AI-generated answers. Adding statistics, quotations and cited sources lifted visibility by up to 40%. Keyword stuffing, the old SEO trick, made visibility worse. In short, AI rewards substance.

AIO: mostly a label

AIO is used inconsistently. Some people mean "AI optimisation" in general; others mean optimising for Google's AI Overviews specifically. Either way it overlaps almost entirely with GEO. Treat it as part of the same job.

Agentic search: the visitor that acts

The newest layer. AI agents can now browse websites, compare suppliers and build a shortlist for a buyer. They need clear facts, consistent details and forms or booking links that work. We covered this in Is Your Website Ready for AI Agents?, and Thursday's post goes deeper into how AI shortlists suppliers.

What actually changes, and what doesn't

What doesn't change: the fundamentals. A fast, well-structured website with useful content written by people who know the subject is still what search engines and AI tools want.

What does change is where the value shows up:

• From clicks to mentions. Many searches now end on the results page. Being named in the answer counts, even when nobody clicks.
• From keywords to substance. Specific numbers, named experts and real examples get cited. Vague copy gets skipped.
• From one channel to many. Buyers search in Google, ask ChatGPT, check reviews and ask an agent to compare. Your facts have to hold up everywhere.

Why we call it one thing: the full search stack

At Growth Partners we don't sell SEO, AEO and GEO as separate services, because the work overlaps so much that splitting it up mostly splits the budget. Mal Jack, our co-founder, puts it simply: "You've heard GEO, SEO, AIO, but what you're really talking about is a full search stack."

Think of it as layers, each built on the one below:

1. SEO makes sure you can be found and trusted.
2. AEO makes your answers easy to lift.
3. GEO makes your facts worth citing.
4. Agentic search makes your business easy to compare and contact.

Our search team works across all four together, and Storyhouse, our creative team, supplies the words, pictures and video that give AI and people something worth quoting.

What to do as a business owner

1. Fix the foundation. Check your key pages are indexed in Search Console, load quickly and are clearly structured.
2. Answer real buyer questions directly. Use the questions in your Search Console data and from sales calls. Put the answer first.
3. Make your content citable. Swap adjectives for numbers, names and sources.
4. Keep your facts consistent everywhere. Website, Google Business Profile, LinkedIn and directories should say the same thing.
5. Measure beyond clicks. Track visibility, mentions in AI answers, branded search and enquiries. Tomorrow's post on the zero-click problem shows how.

One warning. If an agency proposes GEO as a separate retainer on top of SEO, ask what they'd do differently. The honest answer is usually "not much".