Many of the books published today are fiction, meaning that they are in-part or completely untrue. Historically, paper production was considered too expensive to be used for entertainment. An increase in global literacy and print technology led to the increased publication of books for the purpose of entertainment, and allegorical social commentary. Most fiction is additionally categorized by genre.

The novel is the most common form of fiction book. Novels are stories that typically feature a plot, setting, themes and characters. Stories and narrative are not restricted to any topic; a novel can be whimsical, serious or controversial. The novel has had a tremendous impact on entertainment and publishing markets.[27] A novella is a term sometimes used for fiction prose typically between 17,500 and 40,000 words, and a novelette between 7,500 and 17,500. A Short story may be any length up to 10,000 words, but these word lengths vary.

Comic books or graphic novels are books in which the story is illustrated. The characters and narrators use speech or thought bubbles to express verbal language.
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