An Expository Essay is a genre of essay that requires the writer to investigate an idea, explain it, and provide evidence to support their argument. There are several types of expository essays, including descriptive, process, comparison, cause-and-effect, and problem-solving. To write an effective expository essay, one should consider their audience, select a topic of interest, thoroughly research the topic, create an outline, format the paper, craft an interesting introduction, create coherent body paragraphs, develop an assertive conclusion, and review and evaluate the paper.