I think the single most misunderstood and under appreciated computer network server is that of the domain network server. These domain name servers are what allow us to use a simple domain name in our browsers to find a website. If we did not have these kinds of domain servers then we would be stuck in the problem of entering massive ip address numbers to connect to the server we are trying to get information from.
These domain name servers are basically big indexing services that provide a number based ip address in exchange for a domain name. Most people use these everyday without even realizing it. Even if you are not a fan of using computers and don't know how to surf the internet, you use domain servers in your everyday functions. If you go to the store and use a type of credit or debit card to make a transaction then the electronic terminal that is used will often connect to your bank's servers to verify that you have the means to make the transaction. Often these server connections to your bank will use a domain name in addition to specific IP addresses.