A man's best friend is typically referred to be a book. With the concept of an e-book, our best friend has grown into a 'smart' buddy in our continuously changing world, where people strive for more convenient and easy-to-use alternatives for everything. An eBook is a book that is presented in such a format so that it can be read on an electronic device such as a computer or a portable device. Several works that were previously only available in print are now available as eBooks. There are bestselling novels, classics, reference, and scholarly texts among them. An eBook might be only text or it can incorporate audio, video, and hyperlinks. We can read an eBook by using portable eBook reading devices, using special software on PC devices and using handheld computers and personal digital assistants. Since most books are only read once, paying a premium price for paperbacks of novels may be a financial strain. This is a problem that is solved by e-books. In general, e-books are less expensive than paperbacks.