Exposition is one of four rhetorical modes of discourse, along with argumentation, description, and narration. The purpose of exposition is to inform, explain, analyze, or define.
Examples of nonfiction expository writing include textbooks, how-to essays, recipes, cook books, business letters, personal letters, news stories, press releases, research reports, scientific reports, term papers, wills, encyclopedias, and Wikipedia entries.
Within the context of fiction, exposition is the mode by which information is conveyed. The information presented may be in the form of facts, explanation, or opinion and may be used for a variety of purposes, including the development of plot, character, setting, and theme.
Expository writing is a rhetorical mode of writing in which the purpose of the author is to inform, explain, describe, or define his or her subject to the reader. Expository text is meant to ‘posit’ information and is the most frequently used type of writing by students in colleges and universities. A well-written exposition remains focused on its topic and listing events in chronological order. Examples of this type of writing are cooking instructions, driving directions and instructions on performing a task. Key words such as first, after, next, then and last usually signal sequential writing. Personal pronouns may be used in such writing, if needed.