Which type of drama uses theatre itself as part of the content of production,not merely the vehicle?

Question

Quizplus · Accepted Answer

Metatheatre refers to the technique of using the theatre itself as a major part of the content of a production, often by highlighting or commenting on the theatricality or artificiality of the performance. This can involve plays within plays, characters who are aware they are characters in a play, or direct address to the audience, among other techniques.

Which Type of Drama Uses Theatre Itself as Part of the Content