The Wikipedia writes (about 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 leaf is called a page. A book produced in electronic format is known as an e-book.
Books may also refer to a literature 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. The body of all written works including books is literature.
In novels, a book may be divided into several large sections, also called books (Book 1, Book 2, Book 3, etc)”
And, about EBook:
“An e-book (short for electronic book, also written eBook or ebook) is an e-text that forms the digital media equivalent of a conventional printed book, often protected with a digital rights management system. E-books are usually read on personal computers or smart phones, or on dedicated hardware devices known as e-book readers or e-book devices”
Wikipedia Informs us: that EBOOK – just Digital clone of the book.
But says that: “At the same time, authors with books that were not accepted by publishers offered their works online so they could be seen by others. Unofficial (and occasionally unauthorized) catalogs of books became available over the web, and sites devoted to e-books began disseminating information about e-books to the public.
As of 2009, new marketing models for e-books were being developed and dedicated reading hardware was produced. E-books (as opposed to ebook readers) have yet to achieve global distribution. Only two e-book readers dominate the market, Amazon’s Kindle model or Sony’s PRS-500. However, not all authors have endorsed the concept of electronic publishing. J.K Rowling, author of the Harry Potter series, has stated that there will be no e-versions of the books”
It means that with occurrence e-readers the book “getting” into a cover becomes the high-grade book.
EBook it is the BOOK! Book with digital Content. Multimedia Content.
Therefore – it also is called as the electronic book. EBook