Film stock is a term that refers to the actual physical material that is used to capture moving images in a camera. There are many synonyms for film stock, each of which describes different aspects of this fundamental component of filmmaking. Some common synonyms for film stock include celluloid, cinefilm, motion picture film, and reel. These words all evoke a certain nostalgia for the time when film was the dominant medium for cinema. Other synonyms include digital film, film cartridge, and negative film, which all describe specific types of film stock used in different contexts. No matter what synonym is used, film stock remains an essential part of the art and science of filmmaking.