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To fast-forward means to move forward through an audio or video recording at a speed faster than that at which it would usually flow. The term "fasten forward" is also used instead of fast-forward.

To reach a certain portion of a song, a person may fast-forward through a cassette tape by pressing a button (often labeled "Fast Forward" itself) on the tape deck containing the tape. The tape deck's motor activates at a speed higher than usual—for example, double the standard 1-7/8 ips playing speed of the 1/8" cassette tape—and can be stopped by the end of the tape, the pressing of a "Stop" button on the deck (or another button mechanism disengaging the button), or simply lifting a finger from the "Fast Forward" button.

Fast-forwarding is the exact opposite of rewinding, in which tape, music, etc., are moved backward at a user's discretion. In either operation, because of sound distortion, volume is usually muted or severely reduced.

With the advent of inexpensive digital music media, fast-forwarding has most likely lost its past meaning related to the speed of a tape deck motor (or record turntable, or another device allowing fast-forwarding) and now may, especially as cassette tapes and other analogue media are used less and less by younger generations, only apply to the operation of moving ahead in a recording's time frame—accomplished today by simple clicking, dragging a slide image, or even via speech-recognition software. (Still, some CD and DVD players offer tape-style fast-forwarding, so that the user can detect when the destination is reached and stop.)