Quick Answer: A prop, formally known as a property, is an object actors use on stage or screen during a performance or screen production. In practical terms, a prop is considered to be anything movable or portable on a stage or a set, distinct from the actors, scenery, costumes, and electrical equipment. This includes handheld items such as books, cups, weapons, and tools that actors interact with during a performance. Props help to create a realistic setting, convey information, or add to the storytelling by showing details about the characters or the environment.