A Metadata is a component of data which describes the data. It is "data about data." The metadata files on this site describe the content, authors, lineage, and other characteristics of the geographic map layers used in this Web site.

-See also:
"Metadata" is in the UNSPSC Code "43232310"
Metadata management software

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Other /More definition:
Metadata is a The information about a data set which may include descriptive information about the context, quality and condition, or characteristics of a data set. For geographical data this may include the source of the data; its creation date and format; its projection, scale, resolution, and accuracy; and its reliability with regard to some standard.