This document defines and describes various types of sound that can be used in media, including diegetic sound that exists within the fictional world and non-diegetic sound that is heard by the audience but not characters. It also discusses synchronous and asynchronous sound, sound effects, motifs, bridges, dialogue, voiceovers, perspective, scores, incidental music, themes, stings, and ambient sounds. The document provides examples and brief explanations of these different elements to concisely outline key concepts relating to sound in media.