Metadata, or metainformation, means data about other data of any sort in any media. Content item or a collection of data including multiple content items and hierarchical levels are a few things that an item of metadata may describe. When it comes to data processing, metadata is considered like data that provides information about or documentation of other data that is managed within an application. This term should however be used with caution because all data is about something and is therefore metadata. Metadata can include descriptive information about the context, quality and condition, or characteristics of the data and it may be recorded with high or low granularity. Metadata provides context for data, it’s used to ease understanding, characteristics, and to manage the usage of the data. The metadata needed for effective data management differs with the type of data and context of use. For example, in a library, consists usually of data that is the content of the titles stocked, then metadata about a title would usually include a description of the content, the author the publication date and the physical location.
Examples of metadata:
- book
- photograph
- audio
- web page
Resources:
http://en.wikipedia.org/wiki/Metadata
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