Improvised theatre means there is no script. The actors create characters, locations, actions, and dialogue based on audience suggestions. 

Improv comedy techniques have also been used in television and stand-up comedy, in hit shows such as the recent HBO television show Curb Your Enthusiasm created by Larry David, the UK Channel 4 and ABC television series Whose Line Is It Anyway, and  Nick Cannon's improv comedy show Wild 'N Out.