Metadata

Data about the content, format and use of a knowledge resource, compiled to enhance the discoverability of the resource in a digital space, and to give information about the technical and legal standards that govern its use. Metadata therefore usually includes information about
the intellectual content of a resource, digital representation data, and security or rights management information.
Reference: Australian Museums and Galleries Online [http://archive.amol.org.au/capture/course/glossary.html], http://en.wikipedia.org/wiki/Metadata