Digital Audio Tape
Digital Audio Tape is a magnetic tape that permits to record audio. The recording is digital, its quality is similar to that of a compact disc. Originally, it was developed to replace the compact casette. Like tapes used for recording video, the tape can only be played in one direction, the "cassette" only has one side. It competed with Digital Compact Cassette (DCC), and the Minidisc. Unlike these however, it allows for an exact digital copy of the source; DCC and Minidisc use lossy data compression.
DAT tapes have also been used to back up Computer data.