Metadata or meta-information is actually “information about information”. For example, the metadata of a document can describe who created it, when it was created and last edited, what language it was written in, and what program was used. For example, metadata can be used to look up information in a database.
Metadata can be divided into structural metadata, which describes the relationship of the data to other data (often using taxonomy), and descriptive metadata, which is specific to the information it relates to.
