# Schema markup (structured data)

> Schema markup is code added to a page, usually in JSON-LD format and using the schema.org vocabulary, that tells search engines and AI systems exactly what the page is about: an organization, a product, an article, an FAQ.

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**Definition:** Schema markup is code added to a page, usually in JSON-LD format and using the schema.org vocabulary, that tells search engines and AI systems exactly what the page is about: an organization, a product, an article, an FAQ.

**Example:** A recipe page marks up cooking time, ingredients and rating, so search engines can show them right in the results.

## Common mistakes

- Marking up things that are not visible on the page — that breaks the search engines’ rules.
- Copying markup from another site with their name or data left in it.
- Never checking it: one syntax error can make the whole block unreadable.

Related service: [SEO services](https://veilvex.com/services/seo/)

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