Sound

Non-diegetic sound is sound which has been added to support the mood and atmosphere that the filmmaker is trying to convey. 

• Soundtrack
• Voiceover

Diegetic Sound

• Ambient
• Dialogue 
• Sound effect

Pleonastic Sound : Exaggerated sound

Parallel sound: When the sound we hear should usually go in hand with the image on screen. 

Contrapuntal sound: Sounds that don't easily match the image they are accompanying. 

Synchronous - that is, caused by some event on screen, so that sound matches the action. 

Asynchronous - this is separate from the visuals, such as a voiceover or dialogue from another scene.