The purpose of the expository essay is to explain a topic in a logical and straightforward manner. Without bells and whistles, expository essays present a fair and balanced analysis of a subject based on facts—with no references to the writer’s opinions or emotions.
A typical expository writing prompt will use the words “explain” or “define,” such as in, “Write an essay explaining how the computer has changed the lives of students.” Notice there is no instruction to form an opinion or argument on whether or not computers have changed students’ lives. The prompt asks the writer to “explain,” plain and simple. However, that doesn’t mean expository essay writing is easy.