Auto-Tune, or autotune, is an audio processor software 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.
Auto-Tune was originally intended to disguise or correct off-key inaccuracies, allowing vocal tracks to be perfectly tuned. The 1998 Cher song "Believe" popularized the technique of using Auto-Tune to distort vocals. In 2018, the music critic Simon Reynolds observed that Auto-Tune had "revolutionized popular music", calling its use for effects "the fad that just wouldn't fade. Its use is now more entrenched than ever."
In its role of distorting vocals, Auto-Tune operates on different principles from the vocoder or talk box and produces different results.

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