Sound immersion refers to the technique of enveloping the audience in a rich auditory experience that enhances their engagement with a film's narrative. By integrating diegetic sounds (those originating from within the film's world) and non-diegetic sounds (external to the story, like a film score), filmmakers can create an immersive atmosphere that deepens emotional responses and heightens the viewer's connection to the story and characters. This holistic use of sound plays a crucial role in shaping audience perceptions and feelings throughout the film.