Auto-Tune, or autotune, is an audio processor introduced in 1997 by the American company Antares Audio Technologies. It uses a proprietary device to measure and alter pitch in vocal and instrumental music recording and performances.

Pitch correction is an electronic effects unit or audio software that changes the intonation of an audio signal so that all pitches will be notes from the equally tempered system. Pitch correction devices do this without affecting other aspects of its sound. Pitch correction first detects the pitch of an audio signal, then calculates the desired change and modifies the audio signal accordingly. The widest use of pitch corrector devices is in Western popular music on vocal lines.