Plasma arc cutting is a thermal material elimination process that is principally used for cutting thick sections of electrically conducive materials furthermore it can be defined as a "superheated, electrically ionized gas."
To put it in simple and comprehensive terms, it is an arc cutting process that cuts the metal by melting a localized area with a contracted electric arc which removes the molten material with a high speed jet of hot ionized gas concerning from the contracting orifice.