A film, also called a movie, motion picture or photoplay, is a series of still images which, when shown on a screen, creates the illusion of moving images due to the phi phenomenon. This optical illusion causes the audience to perceive continuous motion between separate objects viewed rapidly in succession. The process of filmmaking is both an art and an industry. A film is created by photographing actual scenes with a motion picture camera by photographing drawings or miniature models using traditional animation techniques by means of CGI and computer animation or by a combination of some or all of these techniques and other visual effects.
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Source: Wikipedia