The Library has both print books and ebooks.
Searching Discover IT will find both print and ebooks.
However, as you gain experience in using the library, you may also want to try searching for print books in the Library Catalogue and for eBooks in one of the Library ebook databases.
eBook Academic Collection (EBSCOhost) contains over 150000 ebooks in full text
Ebook Central contains a small collection of c 70 Ebooks
The Print Catalogue allows you to search for print books on the library shelves.