Sound

Within media, there is diegetic and non-diegetic sound that we need to make sure we are able to notice the differences within each other.

Diegetic sound is the sound whose source is visible on the screen or whose source is implied to be presented by the action of the film. This can be presented by:

-voices of the character
-sound made by the object of the study
-instruments in the story (source music)

Diegetic sound is any sound presented as originated from source within the films world which can either be on screen or off screen depending on whatever its source is within the frame or outside the frame.

Non-diegetic sound is whose source is neither visible on the screen or has been implied to be presented in action:

-narrators commentary
-sound effects which is added or dramatic effect

This is represented as coming from the source outside story place, the sound used to create a dramatic effects - the sound that is added in the editing process.

There are many other sounds including :

Ambeint sound - Sounds including traffic, birds etc.

Soundtrack - Music made specifically to fit that film

Soundmotif  - Specific sound for the character

Asynchronous - When the sound has been deliberately made to not match the visual.