A book cover is the outer protective layer of a book, designed to attract readers and provide information about the content inside. It typically includes the title, the author's name, and often an illustration or photograph that reflects the book's theme. The cover can be made of various materials, such as paper or cardboard, and may be glossy or matte. Book covers serve both functional and aesthetic purposes. They protect the pages from damage and dirt while also enticing potential readers. In the publishing industry, a well-designed cover can significantly influence a book's sales and popularity, making it an essential aspect of book marketing.