Certainly Not. Its the infrastructure used to develop a plethora of distributed applications:
World Wide Web, Usenet, SMTP based Mail, Instant Messaging and more.
Along the same lines it might be interesting to shed additional light on the evolving nature of the World Wide Web as one of the more prominent Internet Applications.
Personally, I have always seen the World Wide Web as a distributed collection of arbitrarily linked multi-format databases (structured, semi-structured, and unstructured ). Today the unstructured format dominates, but we are clearly heading toward a period where there is a significant increase in the structured database variant (aka Semantic Web). Thus, we could also be looking at a period where
multi-purpose and
multi-protocol servers -rather than the protocol and purpose specific servers (such as dedicated HTTP-Only Servers) dominate the URI processing realm.