what are the real differences in writing a screenplay compared

books and film are two different types of art/media/whatever and they can't be expressed in the same way. a screenplay is one part of a larger piece of work (the film) whereas a book is literary art in its entirety

>>8315678
Screenplays are basically like play scripts.

>>8315678
Don't get memed by screenwriting. You're basically a hireling unless you are also directing the film.

It's a technical skill not real writing, no one reads screenplays for pleasure, they do not standalone

Screenplays have a place in the story department in pre-production pipelines of film, animation and games. They basically deliver to the storyboard artists a skeleton on which they build their storyboards on. Screenplays are very visual. You don't read about what is going on inside the character, but what the audience sees, what's in the shot, how's everyone dressed, how does the behaviour of this and that character look like. In length for feature films, screenplays are 90-125 pages long, where basically 1 page equals 1 minute on-screen. These are the main differences I can think of. The point is, they just have an entirely different purpose.