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Metadata is data about other data. For instance, when one uploads a multimedia file up to a file-sharing system, this system issues a system document that presents data from what user account the file is uploaded, its timestamp (when it is uploaded), what is its size, what is its title, category, and other tags that the uploading user and/or the system assigned to this file, etc.



According to the BABOK Guide (3rd edition),
Metadata. A description of data to help understand how to use that data, either in terms of the structure and specification of the data, or the description of a specific instance of an object.
According to the CyBOK (version 1),
Metadata. Information about data or sent along with data, e.g., the IP address, the location, or the operative system a message is sent from.

Document metadata

Main wikipage: Document metadata
Any document represent data that is called content. Another part of the document is metadata that includes its title, author, owner, creation and publication dates, etc. The Dublin Core is the standardized set of document's metadata elements.

See also

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