The document discusses different elements of sound design in film and television. It describes how sound must be carefully mixed to emphasize important sounds and set the proper atmosphere. It distinguishes between diegetic sounds, which come from visible or implied sources within the story, and non-diegetic sounds, which do not have a visible source. Examples are given like dialogue, sound effects, and musical scores. Specific sound techniques are also outlined such as synchronous sounds that match the action, asynchronous sounds from outside the story world, and contrapuntal sounds that provide alternative meanings.