Here's a breakdown:
* Diegetic sound: Sound that originates from within the world of the story. This includes sounds the characters can hear, like dialogue, footsteps, or the buzzing of a bee.
* Extra-diegetic sound: Sound that originates from outside the world of the story. The characters cannot hear it, but the audience can.
Here are some common examples of extra-diegetic sound:
* Background music: This is often used to create atmosphere, evoke emotion, or foreshadow events.
* Voiceover narration: This is when a narrator speaks directly to the audience, providing information or commentary.
* Sound effects added in post-production: These can be used to enhance the emotional impact of a scene or to create a specific mood.
* Sound of the audience: This is used in a live performance to indicate the reactions of the audience.
Think of it like this: if you're watching a movie and hear the sound of a car horn, that's diegetic sound because it's something that exists within the world of the film. But if you hear a dramatic piece of music playing during a tense scene, that's extra-diegetic sound because it's not something the characters in the film can hear.
Extra-diegetic sound is a powerful tool that filmmakers can use to manipulate the audience's emotions and understanding of the story.