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Nonfiction books are written works that aim to inform, educate, and provide real-world knowledge and understanding on various subjects. These can be presented in different formats such as physical books, e-books, or audio books. The topics of nonfiction books range from biographies, history, science, technology, self-help, business, travel, and more. The information provided is based on facts, research, and personal experiences. Nonfiction books can serve as valuable resources for learning and expanding one's knowledge on a wide array of subjects.