Diegetic Vs. Non-Diegetic Sound

 What is the difference between diegetic and non-diegetic sound?  What is an example of each that you can think of from a film?

    The difference between diegetic and non-diegetic sound is that diegetic sound is sound that the characters in the film are making or even the sounds that they can hear, non-diegetic sound is the sounds that the characters can't hear and are only included to add immersion for the viewer. An example of non-diegetic sound would be the soundtrack to Bones and All but diegetic would be the noises of them eating on people.