noun
A deformation of a audio signal's waveform, which causes a specific sound. Distortion is usually unwanted, and sound engineers focus to eliminate it. In some situations, however, distortion may be desirable, as it might also be used as a musical effect, particularly with electric guitars, but some engineers tend to distort sounds of drums as well.
noun
A guitar effect, usually in the form of a pedal with knobs and a footswitch.
A DS-2 distortion guitar effect produced by BOSS
The sound of a distorted guitar