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JSON-LD is a structured data concept that adds machine-readable structured data to a page using JSON.
JSON-LD matters because search engines and social systems use structured data to understand entities, pages, and actions. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of JSON-LD 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 JSON-LD.