The Office is a mock documentary, or mockumentary, that aimed to portray “in a realistic style some ordinary American office workers trapped in a confined space with their immature, inappropriate, bizarre, or deluded coworkers and one horribly overconfident supervisor”. In order to further its appearance as a documentary, the show was shot with a single-camera setup without a studio audience or laugh track. The main action of the show is supplemented by talking-head interviews, or “confessionals,” in which characters speak directly to the camera.

Source: Britannica