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A movie studio, or film studio, is a place where movies are made. A movie studio can be an area where the movie is filmed; like an indoor (interior) stage or room, or an outdoor area in which only those making the movie are allowed to be.
The term movie studio also means a production company because these companies often had - in the 1920s to the 1940s - their own studios in their own buildings. Even though most production companies do not now have their own studios, the term is still used in this way.