Distortion is a sound effect which is achieved by distorting signal, especially amplitude clipping. A device or plugin which does this is also called distortion. It's primarily applicable in hard-rock, metal and punk-rock music, when distorting guitar sound. Often all the effects distorting guitar sound or enriching it with harmonics are called distortion. Also applicable with bass guitar.
This particular VST plugin was created for testing simple method of adding asymmetry to guitar distortion. This is a digital effect, which uses direct soft clipping. 8-x oversampling helps to avoid sampling noise at high gain.
Guitarist/vocalist/another live artist (while recording and working at PC), sound engeneer.