Fourth wall
The fourth wall is a common convention in narrative drama in which a metaphorical, invisible, or imaginary wall separates performers (actors, dancers, singers, etc.) from the audience, so that the audience sees through this "wall" into the performed narrative, but the performers behave as if they cannot see the audience in turn. The metaphor has also been extended outside of the theater, for instance to the typical boundary between character and audience in films, videos, or television programs, in which characters behave as if they are unaware of the camera.