In common usage, a sound stage (also written soundstage) is a soundproof, hangar-like structure, building, or room, used for the production of theatrical film-making and television productions, usually located on a secured movie or television studio property.
A sound stage should not be confused with a silent stage. A sound stage is sound-proofed so that sound can be recorded along with the images. The recordings are known as "production sound." A silent stage is not soundproofed, and is susceptible to outside noise interference, and so sound is not generally recorded. Because most sound in movies, other than dialogue, is added in post-production, this generally means that the main difference between the two is that sound stages are used for dialogue scenes, but silent stages are not. An alternative to production sound is to record additional dialogue during post-production using a technique known as dubbing.