What is schema markup?
Schema markup in everyday language
Think of schema markup as a form that you fill in about your page's content, using a standardised vocabulary that search engines already know how to read. Instead of a search engine having to infer from your prose that your page is about a product with a certain price and rating, schema markup tells it directly: this is a Product, the price is £29.99, the rating is 4.5 stars, 87 people have reviewed it. The search engine doesn't have to interpret or guess — the information is handed to it explicitly, in a format it reliably understands.
How schema markup enables rich results
Rich results (sometimes called rich snippets) are the enhanced search listings you sometimes see in Google results — star ratings under a product name, FAQ accordion sections below a page title, recipe information including cook time and calories, event dates and venues. These are only possible when the page has correctly implemented schema markup for the relevant type. A product page without Product schema will never show star ratings in search results, regardless of how prominent those ratings are in the page's visible content. Schema markup is what unlocks the connection between your content and these enhanced displays.
How schema markup relates to AI search and AEO
Beyond traditional rich results, schema markup has become increasingly important for AI-powered search tools. AI systems parsing many pages simultaneously benefit enormously from explicit structured data — rather than running a language model over each page's prose to infer what it's about, they can read structured fields directly. A page with complete FAQPage or HowTo schema is significantly more likely to be accurately extracted and cited by AI answer engines than an otherwise identical page with no structured data. As AI search grows, schema markup transitions from a 'nice to have for rich results' to a fundamental part of making content readable by the full range of modern search tools.
Key Takeaways
- Schema markup tells search engines explicitly what page content means, rather than leaving them to infer.
- Correct schema is required to unlock rich results like star ratings and FAQ accordions in search.
- As AI search grows, schema becomes essential for AI extraction accuracy, not just rich results.