E-books are books, too! They just happen to be available to you online. Just like any of the library's databases, these can be used from anywhere with an Internet connection. When prompted, all you have to do is log-in using your UDC credentials.
Many e-books may be downloaded (chapter-by-chapter or the entire book) and some can even be printed. If you check out an e-book, it will "disappear" from your library account on its due date.
E-books are available in many of the library's databases. You can try a few of them in the list below: