Diegetic and Non-Diegetic sounds

Diegetic Sounds

Diegetic sounds are the sounds that are visible on the screen which shows something happening in the scene that uses sound in it such as:

• Voices of characters
• Sounds made by objects e.g- footsteps, kettle, raining sound, thunder, cars, etc.
• Music coming from instruments in the story

These sound can either be on screen or off screen as long as it has an impact to the movie with the realistic things that are happening in there. 

In Harry Potter, there is a scene where they use diegetic sounds to show the effects of the spells they use. 

Non diegetic sounds to demonstrate the emotions in the scene.

Diegetic sounds when fighting with the light saves to show good effects.

Music in the background to show to make the movie dramatic.

Non-Diegetic Sounds

Non-diegetic sounds are the sounds that are not visible on the screen and is not implied to be present in the action and these include:

• Narrators commentary 
• Sound effects for dramatic effect e.g- horror music to make it scary or sad music to set the scene
• Mood music
• Voice overs

In Harry Potter, a non-diegetic sound would be dramatic music when Harry fights Voldemort to show the audience that the scene is intense.