The document discusses different types of sounds that can be used in films including selective sounds to emphasize key elements, ambient sounds to set the scene, and sound bridges to connect scenes fluidly. It also describes diegetic sounds that belong to the world created on screen like voices and objects, versus non-diegetic sounds from narration or music that don't belong in the real world. Synchronous sound matches the visual action while asynchronous sound comes from outside the scene. Contrapuntal sound may juxtapose noise with visuals to create alternate meanings. Other sounds discussed are voiceovers, theme tunes to introduce characters, musical scores that set atmosphere, and strategic use of silence.