What is an exposition?

Basically,an exposition is a type of written discourse to explain, describe and inform the reader. It informs the readers about the plot, characters, settings and themes in an essay/The writer of the exposition can not assume that the reader has prior knowledge/understanding of the topic that is being discussed. So, the creator of the exposition must be very clear in what they are trying to express and not just blatantly telling the reader what is being discussed. Therefore, an exposition must have a strong organization of content so as to be effective for the reader.