As a generic term, an electronic book (variously: e-book, eBook, e-Book, ebook, digital book or e-edition) or a digital book is a book-publication in digital form, consisting of text, images, or both, readable on computers or other electronic devices. Although sometimes defined as "an electronic version of a printed book", many e-books exist without any printed equivalent. Commercially produced and sold e-books are usually intended to be read on dedicated e-readers. However, almost any sophisticated electronic device that features a controllable viewing screen, including computers, tablets and smartphones can also be used to read e-books. Nowadays, both print as well as e-book selling is moving to the web. For instance, in the United States of America more “books are published online than distributed in hard copy in book shops”. The main reasons that people are buying books online are prices, comfort and selection process. Notwithstanding that most people appreciate higher regular “bricks & mortar” bookshops, “yet almost every single one of us is buying books online”. Based on this information it is almost certain that the e-publishing will soon overtake traditional publishing.