A screenplay writer, scriptwriter or scenarist, is a writer who practices the craft of screenwriting, writing screenplays on which mass media, such as films, television programs and video games, are based.

What does a screenplay writer do?

Screenwriters write and develop screenplays for film or TV drama. They do this either based on an original idea, by adapting an existing story into a screenplay or by joining an existing project (TV). ... Alternatively, a screenwriter may be commissioned by a producer or studio to create a screenplay.

What is the difference between a writer and a screenwriter?

The "writer" creates the "story" of a movie, the plot. The "screenwriter" works on the "screenplay", the dialogues.