With the invention of handheld devices people obtained a possibility to finally extend away from the piles of paperback books. One single pocketbook or smartphone can hold the contents of the whole New York Public Library! No wonder that eBooks are getting more and more popular nowadays.
EBooks are not inferior to the ordinary printed books. They have all the attributes of the latter: cover, pages, author, content, images whatever. Actually you get a full-fledged book, but it doesn’t take the room on your bookshelf. This is especially true about different tutorials and ampliative literature.