ITDB is an acronym for iTunes Datbase. ITDB files are used by the iTunes Media Player to organize music, movies and other media files that are used by the Apple iTunes application. These files are database files that store information pertaining to the audio files that are stored in a user's iTunes library.
Files with the .itdb file extension are stored within the Apple iTunes application folder. These files correspond to the iTunes Genius feature and only versions of iTunes that use this particular feature will use these ITDB files. The first version of iTunes to use the Genius feature was iTunes 8.
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