They are responsible for bringing the material to life. They work with the writers to get a clear vision of how the production should look. They lead the production team in planning for the production, identifying filming or rehearsing schedules, casting for roles, and other aspects that need to be decided upon.
Directors provide direction to the actors to ensure that the actors understand their role and will be able to effectively convey emotions to the audience. They also manage all other crew members and communicate their expectations clearly so that everyone on the set is working towards one vision.