Structured data
Structured data is code, usually JSON-LD using the schema.org vocabulary, that describes a page's content in a machine-readable way: a product, an article, an FAQ.
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What Structured data means
Search engines use structured data to understand pages and to show rich results such as review stars, prices and breadcrumbs. Google says no special schema is needed for AI Overviews or AI Mode, but structured data that matches visible content still helps machines read your facts correctly.