This document defines and provides examples of different types of sound that can be used in films, including diegetic sound that comes from within the scene, non-diegetic sound added in post-production, crescendos that build suspense, diminuendos that signal a threat has passed, and sforzandos used to emphasize a shock or scare. Examples are given from films like Psycho, Jaws, The Godfather, and CSI to illustrate each type of sound technique.