E-book

An ebook is a book in electronic format. It is downloaded to a computer, PC, Mac, laptop, tablet, smartphone or any other kind of reading device, and is read on the screen. It can have numbered pages, table of contents, pictures and graphics, exactly like a printed book.

An electronic book (or e-book) is a book publication made available in digital form, consisting of text, images, or both, readable on the flat-panel display of computers or other electronic devices. Although sometimes defined as "an electronic version of a printed book", some e-books exist without a printed equivalent. Commercially produced and sold e-books are usually intended to be read on dedicated e-reader devices. However, almost any sophisticated computer device that features a controllable viewing screen can also be used to read e-books, including desktop computers, laptops, tablets and smartphones.
Ebooks are portable. You can carry a whole library of hundreds of books with you, on CD, in a laptop, notebook or any ebook reader, without worrying about their weight.