E-Book -  E-books are modern, informative books written and formatted as a pdf file (don't worry what a pdf file is) so that virtually any computer can user can download it.  Once down loaded, it may be read directly off the monitor or it may be printed out and read as a standard book.  The advantage of an e-book is that the book can be ordered and received instantly, while a standard book may take days or even weeks to get into your hands.