Sound

Sound is always used in films to emphasise scenes, and to bring a realistic feeling or to create a uneven atmosphere for the audience, for example in psycho the knife going inside the women and the creepy soundtrack, when she's being murdered. In this post I'll be giving the definitions of sounds used in films.

Diegetic sound is sound which refers to the sound around you, for example music in a car, radio, TV, screams and dialogue.

Non-diegetic sound is the sound which isn't in the scene but is everything outside the world or scene, such as voiceover, soundtrack, captions, titles, subtitles.

On Screen sound is the sound the audience can see the source of sound
Off Screen sound is the sound the audience can't see the source of sound. off screen sound enables an extension of the diegetic world.

For example in this scene from The Good The Bad The Ugly, you can listen to the On/Off Screen sound being established.

Parallel Sound is the sound which matches the sound of the action, for example fight scenes.

Contrapuntal Sound is the sound which doesn't link with the action.

a Sound Bridge helps to create a smooth transition between from one scene to another, so the sound links two scenes together, like a glue.