In filmmaking, behind-the-scenes (BTS), also known as the making-of, 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 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.

Wikipedia. CC BY-SA 4.0. Updated May 29, 2026.