Wikipedia Definition of Documentary (film)

Documentary film is a broad category of moving pictures intended to document some aspect of reality. A "documentary film" was originally a movie shot on film stock—the only medium available—but now includes video and digital productions that can be either direct-to-video or made for a television programme. "Documentary" has been described as a "filmmaking practice, a cinematic tradition, and mode of audience reception" that is continually evolving and is without clear boundaries.