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Structured Data is a SEO metadata concept that describes page entities in a machine-readable format.
Structured Data matters because structured data can improve discovery, previews, and crawler understanding when it matches visible content. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of Structured Data as a proof or operations tool for the live product. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it when launch, analytics, revenue, reliability, or production proof matters. In practice, name the owner, input, output, failure mode, and proof before relying on Structured Data.