But now there are too many names for one organization to administer. Enter DNS which administers names by domains. The first part is the name of the computer. The rest is domains, which are sorted from local to global. But names usually give you useful clues about locations.
Machines can have multiple names.
Names are not necessary for communication. It is better to use names than addresses. This is a broad category. National Research and Education Network Portion of the Internet is dedicated to supporting research and education. Commercial use, such as advertising and marketing.