Even in this forum I can do that.
Cnet for example.
http://www.w3schools.com/html/html_links.asp tells more but it's no mystery and something that's been around since about 1995 (http://en.wikipedia.org/wiki/HTML )
I occasionally receive in my Inbox an email from a friend which contains a link to a web site wherein the URL of the web site was changed to some descriptive words. I am interested in knowing the method to accomplish that change.