Improvisational theatre, often called improvisation or improv, is the form of theatre, often comedy, in which most or all of what is performed is unplanned or unscripted: created spontaneously by the performers.

What does it mean when actors improvise?

Improvisation is any unscripted dramatic performance generated spontaneously by the actors performing.

What is the improvisational approach?

Improvisation: to act without a predetermined text. An improvisational approach is the opposite of working with a written script where lines have been set and actors memorize the dialogue as written.