SEO vs GEO: what changed when AI started answering

The one-line definition

SEO optimizes a page so Google ranks it in the ten blue links. GEO — Generative Engine Optimization, sometimes called AI Search Engine Optimization or AEO — optimizes a page so ChatGPT, Perplexity, Claude, and Google AI Overviews cite it inside the answer they generate.

Ranking gets you a click if the user scrolls. Citation gets you named in the response the user reads.

Side-by-side

Why keyword density stopped mattering

SEO grew up in an era when Google's ranker was a bag-of-words model amplified by a link graph. Stuffing a page with "best HVAC Chicago" moved the needle. Language models don't work that way. They read for meaning, then quote what sounds most like a direct answer. A page that says "we are the best HVAC company in Chicago" fifteen times gets ignored; a page that says "Brothers Heating repairs furnaces in Logan Square within two hours" once gets quoted.

What replaced the backlink

Backlinks still count — LLMs weight them as one of many trust signals — but they've been joined by:

• Schema markup (JSON-LD) that names your business as a machine-readable entity.
• Cross-source consensus: the same claims appearing on your site, your Google Business Profile, your Wikipedia entry, and third-party reviews.
• Quotable sentences: short, declarative, verifiable copy that answers a user's question directly.
• Entity coherence: consistent name, address, phone, and description across every surface.

The overlap: what still transfers

GEO isn't a rejection of SEO — it's a superset. The fundamentals still matter: fast pages, clean HTML, HTTPS, a real sitemap, alt text on images, semantic headings, one H1 per page. If your SEO is broken, your GEO will be broken too. But polished SEO on its own no longer earns citations. You have to add the entity layer.

A worked example

Query: "who does emergency plumbing in Bridgeport Chicago?"

SEO winner (2018): whichever plumber had the most links from local directories and the phrase "emergency plumber Bridgeport" in the title tag.

GEO winner (2026): the plumber whose homepage says, in one sentence, "Ace Plumbing responds to emergency calls in Bridgeport, Canaryville, and McKinley Park within two hours, 24/7," backed by LocalBusiness schema, a Google Business Profile with matching hours, and reviews on Google and Yelp that repeat the same claim.

How to measure GEO

You can't watch GEO in Google Search Console. You measure it by asking the AI systems themselves. Once a week, open ChatGPT, Perplexity, Claude, and Google, and type the five questions your best customers ask. Count how often your business appears in the answer. That number is your citation share, and it's the only GEO KPI that matters.

The Found AEO Check automates this: it asks Perplexity and Gemini real customer queries in your market, checks your Google Business Profile visibility, and returns a score with a personalized fix plan.

Where to start

1. Read the Local Business Guide to GEO for the full framework.
2. Run the free AEO Check on your site.
3. Fix the top three findings — usually entity clarity, schema, and quotable homepage copy.
4. Re-run the check in two weeks and compare your citation share.