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Information about a page used by browsers, crawlers, and social previews.
Metadata includes title, description, Open Graph tags, canonical links, robots rules, and sometimes structured data. It helps machines understand the page before a user clicks.
Plainly
Think of Metadata as the checklist that keeps the app open for real people. Information about a page used by browsers, crawlers, and social previews.
In practice
Use it when a change has to survive deploys, users, incidents, analytics, or billing reality. In practice, define the owner, input, output, and failure mode before you rely on it.