All of the information in a non-fiction book is based on the known true facts. Nothing can be made up. Non-fiction books include how-to books, science books, history books, biographies, autobiographies and much more. Non-fiction books can be about any subject.
A biography is the story of a real person's life, written or told by another person.
An autobiography is the story of a real person's life, written or told by that person.
Fiction Fictional stories may be based on actual events or people or may be based entirely on the author's imagination, but fictional stories all contain elements that are made-up or created by the author.
Folk tales are stories with no known creator. They were originally passed down from one generation to another by word of mouth. The authors on folk tale books today are retelling these stories. Although, folk tales are sometimes based on real historical figures, there are fictional elements to the story. Tall tales are generally folk tales in which the main character is bigger than life in some way -- examples would be Paul Bunyan, Mike Fink, Swamp Angel, etc. Fairy tales were often created to teach children behavior in an entertaining way.
Myths are stories that usually explain something about the world and involve gods and other supernatural beings.
Poetry is verse written to create a response of thought and feeling from the reader. It often uses rhythm and rhyme to help convey its meaning.