Sound within a flim

There are two main types of sound within a film; diegetic and non-diegetic.
Diegetic sound refers to sound within world of the text, for example the dialogue within the flim would be classed as diegetic. 


Diegetic sound however, can also be broken down into on-screen and off-screen sound;
On-screen sound is sound that we can see being made on the film such as a person walking, we can see and hear their footsteps. 
Off-screen sound is when the sound is being made from another place within the world of the text, we can not see the source of the sound but however it is still being made in the world of the text, for example footsteps from a protagonist in the distance which we can't see.


Non-diegetic is the sound that is not the world of the text, this could be example narration or background music.