non-diegetic sound is type of sound is not heard by characters in the world of the film (meaning only the audience can hear it)
What is non-diegetic sound?
Non-diegetic sound is any sound in a film that doesn’t originate from the world of the film. These are typically sounds that are added for effect in post-production. For example, a film soundtrack is almost always non-diegetic sound because the characters don’t hear it. The short answer to what is non-diegetic sound is this: If the characters can't hear it, it's non-diegetic.
Examples of Non-Diegetic Sounds---
Character narration
Soundtrack or music overlay
Sound effects outside of the film-world
Diegetic sound--
Diegetic sounds are those that link to something visible on screen, and can also be heard by the characters. This includes dialogue and the sounds of objects/things on the screen.
Learn more about Non- Diegetic sound ---
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