Non-Fiction books are real books that tell, inform, teach, and explain things about the topic you´re reading about.
There´s many things that are different between fiction texts, and non-fiction texts. This picture shows that there´s only one kind of non-fiction while there´s many different kinds of fiction.
Non-Fiction text can be found in textbooks, essays, biographies, reliable sources, etc.
There´s many ways to set up a non-fiction text. Which is called text features, which could include headings, a glossary, pictures, maps, different types of font, etc.