A screenplay is a written work that describes the shots and scenes in a movie. It teaches how films are constructed as carefully crafted stories meant to elicit specific emotions, similar to books. Understanding screenwriting gives insight into how movies are created and allows writers to feel empowered in completely controlling a film's story. A screenplay follows a particular format and deals in visual elements and pieces of filmed action rather than internal thoughts, so writers must show rather than tell to visualize what will appear on screen.