documentary film, motion picture that shapes and interprets factual material for purposes of education or entertainment. Documentaries have been made in one form or another in nearly every country and have contributed significantly to the development of realism in films. John Grierson, a Scottish educator who had studied mass communication in the United States, adapted the term in the mid-1920s from the French word documentaire. The documentary-style film, though, had been popular from the earliest days of filmmaking. In Russia, events of the Bolshevik ascent to power in 1917–18 were filmed, and the pictures were used as propaganda. In 1922