(1) The part of a magnetic tape unit that holds and moves the tape reels. The term may refer to any equipment that serves as a physical framework for electronic or mechanical devices. See rack. See also DEC.

(2) A component that is designed to provide a media source for an audio or video system. Decks do not have built-in amplification and speakers or a screen for display. Typical decks are VCRs and CD and DVD players or changers, which are often mounted in a stereo or home theater rack. When installed in a computer, CD-ROM and DVD players are called "drives" rather than decks. See rack.