Metadata is data about data. In other words, it is information that is used to describe the data contained in something such as a web page, document or file. Another way to think of metadata is as a brief explanation or summary of what the data is about.
A simple example of metadata for a document might include a collection of information such as the author, file size, date of the document, and keywords to describe the document. The metadata for a music file may include artist name, album and year of release.
For computer files, the metadata may be stored within the file itself or elsewhere, such as in the case of some EPUB book files that hold the metadata in the associated ANNOT file.
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