Diegetic Sound

Diegetic Sound - Sound whose source is visible on the screen or whose source is implied to be present by the action of the film:

• voices of characters 
• sounds made by objects in the story 
• music represented as coming from instruments in the story space 

Diegetic sound is any sound presented as originated from source within the film's world Digetic sound can be either on screen or off screen depending on whatever its source is within the frame or outside the frame.
Another term for diegetic sound is actual sound.



Throughout this clip diegetic sound is used, all of what the audience hears is real sound and is present on set.