A book is a set of written, printed, illustrated, or blank sheets, made of ink, paper, parchment, or other materials, usually fastened together to hinge at one side

A book is a set of written, printed, illustrated, or blank sheets, made of ink, paper, parchment, or other materials, 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. A book produced in electronic format is known as an electronic book (e-book).

Questions having the tag regards books in the field of User Experience, Usability, Information Architecture, Interaction Design, Information Design and other UX related topics.

Reference: http://en.wikipedia.org/wiki/Book