Theatre directors direct actors. They spend many hours during many nights over the course of many weeks working with their actors. In most cases, it is the director who casts the actors for a stage production so they are familiar with what the actors are capable of and what they bring to the table and they work closely with them to build on that. Directors teach the actors their blocking. They break down the scenes and develop the characters with them, explaining what they should be feeling or doing in each scene to convey to the audience precisely what needs to be understood. They give feedback during and after each rehearsal and they polish the performance and perfect the show before opening night.