A film can exist without sound or music, although these elements are critical to the way the story is told. But a film can never exist without images. The best films are the ones that tell a story as visually as possible from start to finish. The script or screenplay is the overall description of the entire movement of a film. People often refer to a good film script when what they actually mean is that they liked the dialogue.
Dialogue refers to any spoken words that occur in a film.
But dialogue is not the script. In a screenplay, every aspect of the story is broken down into scenes. Each scene serves a specific purpose. How those scenes are organized, how a compelling story is built, and how a script can create a blueprint for the visual language of a film is what this chapter is all about. They can be inspired by real life events, books or plays, or they can spring out of the writer's imagination or experience.