Reading or studying e-books on your computer screen enables you to go to any page or chapter in the book with just a few mouse clicks, even if the book has thousands of pages!
All of the e-Books on this site allow you to copy and paste the text of the book into another computer file, instead of retyping by hand.
You can copy and paste E-books on memory card of your mobile, so you can study at any time even in traveling. For this you need to install adobe reader in to your handset (If not already installed by the manufacturer). This is freely available on Internet for mobile use.
These are just a few of the features and conveniences of having a book in electronic format.