Movie screen
A movie screen is a surface on which a movie projector plays a movie.  They are sometimes a wall, sometimes a cloth, and sometimes paper.  Theaters have movie screens, and some people have them at home.  Movable movie screens are made to be used where there is not a movie screen already.  Screens are white or grey so that the movie shows up nicely on the screen. This lets the people watching the movie see it easily.