Metadata is data about data. An item of metadata may describe an individual datum, or content item, or a collection of data including multiple content items. Metadata (sometimes written 'meta data') is used to facilitate the understanding, use and management of data. The metadata required for effective data management varies with the type of data and context of use. In a
library, where the data is the content of the titles stocked, metadata about a title would typically include a description of the content, the
author, the publication date and the physical location. In the context of a
camera, where the data is the photographic image, metadata would typically include the date the
photograph was taken and details of the camera settings. On a portable music player such as an
Apple iPod, the album names, song titles and album art embedded in the music files are used to generate the artist and song listings, and are metadata. In the context of an
information system, where the data is the content of the
computer files, metadata about an individual data item would typically include the name of the field and its length. Metadata about a collection of data items, a computer file, might typically include the name of the file, the type of file and the name of the data administrator.
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