A book chapter is a distinct section of a book that focuses on a specific topic or part of the story. Chapters help organize the content, making it easier for readers to follow the narrative or understand the material. Each chapter typically has a title or number, indicating its order in the book. Chapters can vary in length and style, depending on the genre and purpose of the book. In fiction, chapters often build suspense or develop characters, while in non-fiction, they may present different themes or concepts. Overall, chapters serve as essential building blocks of a book, guiding readers through the content.