Book format refers to the physical and digital presentation of a book, including its size, layout, and binding. Common formats include hardcover, paperback, and eBook. Each format has distinct characteristics, such as durability and portability, which can influence a reader's choice. In addition to physical formats, book format also encompasses elements like font size, margins, and illustrations. These design choices affect readability and overall aesthetic appeal. Understanding book format is essential for authors and publishers to effectively reach their target audience and enhance the reading experience.