The phrase "nonfiction category" refers to a group of books or other written works that are based on real events, facts or information. These works are not fictional, meaning they do not contain any made-up stories or characters. The nonfiction category includes a wide range of genres such as biographies, memoirs, history books, self-help guides, scientific texts and more. These works are intended to provide knowledge, insight or entertainment through the accurate portrayal of real-life events, people or ideas.