Original: Pressure sensitive tape, PSA tape, self stick tape or sticky tape consists of a pressure sensitive adhesive coated onto a backing material such as paper, plastic film, cloth, or metal foil. It is sticky (tacky) without any heat or solvent for activation and adheres with light pressure.
Simplified: Adhesive tape that will stick with application of pressure only (i.e. without activation by water, solvent or heat) is known as pressure sensitive tape.