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.
The purpose of a book is to be read by the eyes or by fingertips and in some cases by hearing to gather information that has been recorded or printed onto a piece for the transferring of information to the brain for processing.
Book may also refer to a literary work, or a main division of such a work. In library and information science, a book is called a monograph, to distinguish it from serial periodicals such as magazines, journals or newspapers.

A book is a collection of leaves of paper, parchment or other material, bound together along one edge within covers. A book is also a literary work or a main division of such a work. A book produced in electronic format is known as an e-book

This question is quiet early question. this must and will be asked a few years later in the light of the technology growth. as now a days we are unable to see even talapatras, slates etc. the books will also be disappear after a modernizations.

A book is aset of written, printed, or blank pages fastened along one side and encased between protective covers.

It\'s is the bible of knowledge and information