What happens in the exposition of a play

the character and the complication develop
the central problem and main character are introduced.
The character learns a lesson and problems are resolved
unexpected twists are introduced into the plot.

In the exposition of a play, the setting, characters, and initial situation are established. The audience is introduced to the main conflict or problem that the characters will face. The exposition sets up the rest of the play by providing important background information and context for the events that will unfold. It is the first act of the play and it is crucial for setting the stage for the rest of the story.