Auditory realism refers to the use of sound in film that mimics or reflects real-life experiences, enhancing the believability of the narrative. This concept is crucial for establishing a connection between the audience and the film's diegesis, where sounds can either be diegetic, coming from within the film's world, or non-diegetic, originating outside of it. Understanding auditory realism helps in grasping how sound design shapes viewer perception and emotional engagement with the story.