simply means realistic or logically existing, such as the music that plays on a character's radio in a scene; more generally, it refers to the narrative elements of a film (such as spoken dialogue, other sounds, action) that appear in, are shown, or naturally originatewithin the content of the film frame; the opposite is non-diegeticelements, such as sounds (e.g., background music, the musical score, a voice-over, or other sounds) w/o an origin within the film frame itself; in an objective shot, the most common camera shot, it simply presents what is before the camera in the diegesis of the narrative