This is a special section of an MP3 file that contains information about the title, artist, genre, and more. This provides much more information than just the file name could provide. [see also MP3, Metadata

A file tag for the MP3 format which stores a small amount of information, like song name, artist, data, album, year, genre, and comment.

RealJukebox Plus is ID3 (version 1.1) compatible. This means track information (track title, artist name, genre, etc.) is stored in your actual music files, not just in the RealJukebox database.

A "tag" or collection of data, embedded in MP3 files, which identifies the song with information like artists, title, album and genre. These tags can be edited.