Digital Audio Tape (DAT) is a magnetic tape format used for audio recording and playback. It was developed by Sony in the late 1980s and was widely used in the 1990s. DAT tapes are capable of storing up to two hours of audio on a single cassette, making them a popular choice for recording music and other audio. DAT tapes are still used today, although they have been largely replaced by digital formats such as MP3 and WAV.