This document discusses how sound is used in film to generate meaning and elicit emotional responses from viewers. It outlines the differences between diegetic and non-diegetic sound and provides examples of each. Specific scenes from Jaws and Rear Window are analyzed to show how diegetic and non-diegetic sound establishes tone, atmosphere, genre and narrative elements. The document also discusses how sound can be used to characterize people and settings, signal changes, and move the plot forward.