Diegetic sound refers to audio elements that originate from within the story world - such as dialogue, footsteps, door slams, or music playing from an on-screen radio. Both the audience and characters can hear it. Non-diegetic sound, by contrast, includes elements like background scores or narration.
Diegetic sound anchors the viewer in the scene’s reality and adds realism. It shapes realism, builds immersion, and influences how viewers interpret character experiences. Understanding diegetic sound helps filmmakers balance realism with emotional impact.
Use diegetic sound for authenticity - like conversations, ambient noise, or in-world audio sources. It contrasts with non-diegetic sound like voiceovers, musical scores, or sound design added for effect.
Keep it authentic – Ensure diegetic sounds match the visual source to preserve realism.
Balance with non-diegetic – Layer with score, narration, or SFX without overshadowing the in-world audio.
Use for immersion – Employ ambient diegetic sounds (traffic, chatter, nature) to ground the viewer in the scene.