making-of

documentary that goes "behind the scenes" of the production of a creative work

In cinema, a making-of, also known as behind-the-scenes, the set or on the set is a documentary film that features the production of a film or television program. This is often referred to as the EPK (electronic press kit) video, due to its main usage as a promotional tool, either concurrent with theatrical release or as a bonus feature for the film's DVD or Blu-ray release.
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