Professional wrestling (often shortened to pro wrestling or simply wrestling) is a form of performance art and entertainment that combines athletics with theatrical performance. It takes the form of events, held by touring companies, that mimic a title-match combat sport. The unique form of sport portrayed is fundamentally based on – and evolved from – classical and "catch" wrestling, with modern additions of striking attacks, strength-based holds and throws and acrobatic maneuvers. Much of these derive from the influence of various international martial arts. An additional aspect of combat with improvised weaponry is sometimes included.