Dubbing is the English term for the technique of dubbing, more correctly for doubling. The dubbing technique is used for dubbing but also for improving the signal-to- noise ratio and for special effects.
In dubbing, several existing audio tracks are mixed together into one, thereby freeing up audio tracks for dubbing. For example, if an audio recording occupies four of four audio tracks, then dubbing allows two audio tracks to be mixed together to form a new one, leaving two free audio tracks after dubbing.
When dubbing video tapes, only the audio track is erased and re-recorded. The picture track and the track for dubbing remain untouched during audio dubbing. Overdubbing is when an additional audio track is recorded while simultaneously listening to the other audio tracks. Overdubbing has become a common recording technique with the advent of multitrack recording.