Schema markup is a behind-the-scenes layer that does not change how a page looks to visitors but changes how machines read it. It is written in a shared vocabulary maintained at Schema.org, a project supported by Google, Microsoft, and other search companies, and it has become a standard part of technical SEO.
What Does Schema Markup Do?
By labeling parts of a page, for example marking that a number is a price, a block is a review, or a passage answers a question, schema markup lets search engines understand the content with less ambiguity. This can qualify a page for rich results, the enhanced listings with stars, prices, or FAQ dropdowns that stand out in search, and it helps systems place the page correctly in their understanding of entities.
What Are Common Types of Schema?
- Article: labels a blog post or news article and its author and date.
- Product: marks price, availability, and reviews for an item.
- FAQ: identifies question-and-answer pairs on a page.
- Organization and LocalBusiness: describe a company, its name, logo, and contact details.
- Breadcrumb: shows a page's position in the site structure.
How Is Schema Markup Added?
The recommended format is JSON-LD, a small block of structured code placed in the page's HTML. It sits separately from the visible content, which keeps it easy to maintain, and it is the format search engines prefer. The markup should accurately reflect what is actually on the page, since marking up content that is not visible can be treated as spam.
Why Does Schema Matter for AI Search?
As search shifts toward AI-generated answers, helping machines understand content becomes more valuable, not less. Clear structured data supports the knowledge graph that systems use to reason about entities, and it makes content easier for answer engines to interpret and extract, which is why schema is a practical part of AEO and appearing in AI Overviews.
Frequently asked questions
What is schema markup used for?+
Schema markup labels the meaning of content on a page using the Schema.org vocabulary, so search engines and AI systems can understand it reliably. It can qualify a page for rich results and helps machines interpret and place the content correctly.
Does schema markup improve rankings?+
Schema is not a direct ranking factor, but it helps search engines understand content and can earn rich results that improve visibility and click-through. It also makes content easier for AI answer engines to interpret and cite.
What format should schema markup use?+
JSON-LD is the recommended format. It is a small block of structured code placed in the page's HTML, kept separate from the visible content, and it is the format search engines prefer. The markup should accurately reflect what is on the page.