SEO vs GEO vs AEO in 2027: What Each One Means and Where to Start

Every few years search marketing picks up a new acronym, and most of them fade. These two are different. A growing share of your customers now ask an AI assistant before they open a search engine, and the AI does not show ten blue links. It writes one answer and cites a handful of sources. If you are not one of them, you are invisible for that question.

So what is the actual difference between SEO, AEO and GEO, and where should a small business spend its time in 2027? Here is the plain-English version.

What is SEO in 2027?

Search engine optimization is the work of earning a high position in classic search results on Google and Bing. It covers technical health (can search engines crawl and index your pages), relevance (does your page match what people search for) and authority (do other sites trust you enough to link to you).

SEO is not going away. AI assistants still lean on search indexes to find pages. A widely shared analysis by Seer Interactive found that 87 percent of ChatGPT search citations matched pages in Bing’s top organic results. In other words, if search engines cannot find you, AI cannot either.

What is AEO?

Answer engine optimization is about becoming the direct answer. Think featured snippets, People Also Ask boxes, voice assistant replies and the summary block in Google AI Overviews. There is usually one answer slot, so AEO rewards pages that state the answer clearly, early and in a format a machine can lift without editing.

In practice, AEO means building a list of the real questions customers ask, giving each one a clear heading, answering it in the first 40 to 60 words and marking it up with structured data such as FAQPage or HowTo.

What is GEO?

Generative engine optimization is about being named and cited inside answers written by large language models. The term comes from a 2024 research paper by Princeton University and Georgia Tech, which found that adding citations, quotations and statistics to a page lifted its visibility in AI answers by up to 40 percent.

GEO goes beyond your own website. AI assistants build their picture of a business from many sources: your site, your Google Business Profile, reviews, directories, news coverage, partner listings and social profiles. When those sources agree on who you are and what you do, the AI can recommend you with confidence.

SEO vs AEO vs GEO at a glance

	SEO	AEO	GEO
Goal	Rank in search results	Be the direct answer	Be cited or recommended by AI
Where it shows	Google and Bing results	Snippets, voice, AI Overviews	ChatGPT, Gemini, Perplexity, Copilot, Claude
Main levers	Keywords, links, technical health	Question headings, short answers, schema	Facts, sources, brand mentions, consistency
How you measure it	Rankings, clicks, impressions	Snippet and AI Overview appearances	Share of AI answers that mention you
Time to results	Months	Weeks to months	Weeks for technical fixes, months for authority

Where they overlap

The overlap is bigger than the acronyms suggest. All three reward the same foundation:

• A fast, crawlable site. Pages that load quickly and render without heavy scripts are easier for every crawler to read. Our own site scores 100 in all four Lighthouse categories, and here is how we got there.
• Structured data. Organization, LocalBusiness, Article and FAQPage markup tell machines exactly who you are and what each page answers. See our guide to schema markup and llms.txt.
• Clear, specific content. Vague marketing copy rarely ranks, rarely wins a snippet and rarely gets quoted.
• Trust signals. Named authors, real credentials, reviews and mentions from reputable sites.

Where they differ

The biggest difference is what counts as a win. SEO counts clicks. AEO and GEO often produce zero-click visibility: a customer reads your answer or sees your name, then calls you later or searches your brand directly. That is why brand searches and direct traffic are worth watching alongside rankings.

The second difference is how much off-site reputation matters. Research from the University of Toronto on AI search citations found that AI engines lean heavily on earned, third-party sources rather than a brand’s own pages. For GEO, a mention in a local news story, a partner directory or a respected industry list can matter as much as a new page on your site.

Which one should you start with?

1. Fix the SEO foundation first. Make sure your site is indexed in both Google and Bing, loads fast on mobile and has one clear page per service.
2. Add AEO formatting. Rewrite key pages so each one opens with a direct answer, uses question-style headings and includes a short FAQ.
3. Build GEO authority. Keep your business details identical everywhere, earn reviews that mention specifics, publish original data and get mentioned on trusted sites.

If you want the deep dive on each one, read our GEO playbook for 2027 and our AEO guide.

Frequently asked questions

Is GEO replacing SEO?

No. GEO builds on SEO. AI assistants use search indexes to find pages, so a site that is weak in SEO is usually weak in AI answers too.

Are AEO and GEO the same thing?

They overlap heavily and many marketers use the terms interchangeably. AEO focuses on winning one direct answer, while GEO focuses on being cited or recommended inside longer AI-written answers.

Can a small business compete in AI search?

Yes. AI answers for local and niche questions often cite smaller, specific businesses with clear information over big brands with vague pages.

How do I know if AI assistants mention my business?

Ask ChatGPT, Gemini, Perplexity and Copilot the questions your customers ask, every month, and track how often you appear. Also watch referral traffic from chatgpt.com, perplexity.ai and gemini.google.com in your analytics.

Want help with SEO, AEO and GEO?

Mediasoli is a Waterloo, Ontario studio that builds fast websites and runs SEO and AI search optimization for businesses across Canada. Tell us about your business and we will show you where you stand in search and AI answers today.

Sources

• Aggarwal et al., GEO: Generative Engine Optimization (Princeton University and Georgia Tech)
• Seer Interactive, 87 percent of SearchGPT citations match Bing’s top results
• Google Search Central, Introduction to structured data