Metadata is "data [information] that provides information about other data". Three distinct types of metadata exist: structural metadata, descriptive metadata, and administrative metadata. Structural metadata is data about the containers of data. For instance a "book" contains data, and data about the book is metadata about that container of data. Descriptive metadata uses individual instances of application data or the data content.
https://d3fend.mitre.org/dao/artifact/d3f:Metadata/
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