A book is a medium for recording information in the form of writing or images, typically composed of many pages (made of papyrus, parchment, vellum, or paper) bound together and protected by a cover.
The technical term for this physical arrangement is codex (plural, codices). In the history of hand-held physical supports for extended written compositions or records, the codex replaces its immediate predecessor, the scroll. A single sheet in a codex is a leaf, and each side of a leaf is a page.
As an intellectual object, a book is prototypically a composition of such great length that it takes a considerable investment of time to compose and a still considerable, though not so extensive, investment of time to read.
This sense of book has a restricted and an unrestricted sense. In the restricted sense, a book is a self-sufficient section or part of a longer composition, a usage that reflects the fact that, in antiquity, long works had to be written on several scrolls, and each scroll had to be identified by the book it contained. So, for instance, each part of Aristotle’s Physics is called a book.
Publishing is the activity of making information, literature, music, software and other content available to the public for sale or for free.
Traditionally, the term refers to the distribution of printed works, such as books, newspapers, and magazines. With the advent of digital information systems, the scope has expanded to include electronic publishing such as ebooks, academic journals, micropublishing, websites, blogs, video game publishing, and the like.
Source : Wiki