Book is the basic elements of the civilization. Since the old days books are used for collection of knowledge and significance of civilization. In simple meaning a books is a set of written and printed papers.
In broad term a books is a collection of written, printed, illustrated, or blank sheets, made of paper, parchment, or other various material, usually fastened together to hinge at one side. A single sheet within a book is called a leaf, and each side of a leaf is called a page.