A '''book''' is a set or collection of written, printed, illustrated, or blank sheets, made of paper, parchment, or other material, usually fastened together to hinge at one side. A single sheet within a book is called a leaf, and each side of a sheet is called a page. A book produced in electronic format is known as an e-book. | A '''book''' is a set or collection of written, printed, illustrated, or blank sheets, made of paper, parchment, or other material, usually fastened together to hinge at one side. A single sheet within a book is called a leaf, and each side of a sheet is called a page. A book produced in electronic format is known as an e-book. |