What are the improvements of hiding part of the URL? >Like, who actually runs separate HTTP servers on example.com and www.example.com anyway? My university d

What are the improvements of hiding part of the URL? >Like, who actually runs separate HTTP servers on example.com and www.example.com anyway? My university doesn't work with example.com but does work with www.example.com. I see how someone could waste a lot of time trying to solve a nonexistent network issue because typing example.com doesn't work, but he had seen it working before.