Screenwriters play a huge role in the production of film, they write the script of the said film or TV show in pre-production. Screenwriters don't just have to create the script beforehand they have to put a lot of research into their ideas to see whether it's a good idea or not. Screenwriters create the blue-prints for the producer, director, production designer, composer, editor, cast and crew. This is why the screenplay is such an important part as it allows these people to understand their tasks and what they need to do. A screenplay should allow the person reading it to imagine how the film will look and work on screen, featuring the characters, plot, setting, etc.
Screenplays have a specific format, all screenplays are wrote in 12-point Courier this is because Courier is a fixed-pitch font, which means each character
is exactly the same width. It is designed this way so that
one page approximately equals one minute of screen time. Here's an example of a typical screenplay:
