It's almost similar to URL forwarding, a domain can be forwarded to other website's address. For example, abcde.com => fghij.com
when user types http://abcde.com in a browser, it will automatically open this website, http://fghij.com (the address bar also shows the new website's URL)
The difference between URL forwarding and URL framing is in URL Framing, the address bar will only show the original address abcde.com, but the website page belongs to fghij.com