Narration structures a story through time and space to guide the audience's understanding. There are three key theorists of narration: Tzvetan Todorov's theory of equilibrium, disequilibrium, recognition, reparation, and new equilibrium; Levi-Strauss's use of binary oppositions between good and bad characters; and Vladimir Propp's concept of the rise and fall of the villain overcome by the hero, often with the involvement of a femme fatale. Narration helps the audience identify characters and their roles through techniques like lighting, camera angles, and shot types.