A screenplay is the words for a movie or TV show, written down so the actors can say them and the people making the movie know what to do.
A screenplay is an important part of making a movie or TV show. It is like a map for the actors and the people making the movie.
Examples:
The screenplay tells the actors what to say.
The screenplay for the new movie is very exciting.
She wrote the screenplay for the TV show.
I want to write a screenplay for a movie about space cats.
The screenplay for the movie was as big as a house!
He read the screenplay and knew just what to do in the movie.