Nonfiction is a writing that is based on facts, real events, and real people. Some examples would be books about history, biographies, and fact books.
Your textbooks are filled with past events, and real information. Fact books are also nonfiction because they provide real information and facts about that subject. Biographies and autobiographies is another example because they are based off a real person's life that actually experienced those events.
What's the Difference?
Fiction is fake, because it's made up from imagination. Nonfiction is the opposite. Nonfiction is real, because it contains real facts, real people, and real events that actually happened.
Nonfiction books include features that help you navigate and understand the text more easily. Some examples would be table of contents, headings, glossary, pictures, captions, bold print, etc.
Maps show where events took place or where things are located.
Timelines show the order of when events took place during a certain period of time.
Graphs show the relation between two variables.
The text structures of nonfiction are description, sequence, compare & contrast, problem & solution, and cause & effect.
Opinions vs. Facts
Nonfiction books contain facts not opinions. Facts are statements that can be proven true or false. An opinion is an expression of a person's feelings that cannot be proven and are also biased. So watch out when your reading something because it can contain bias information.
My favorite nonfiction book is Jackie's Nine. This book contains events that happened during Jackie's life. Jackie Robinson is really inspiring to me and I enjoy learning about him and his achievements.