What is a domain name? A domain name is a unique name, kind of like an e-mail address is unique, which is registered in a database called WHOIS through an organization called Network Solutions, Inc. (NSI). The domain name corresponds to a unique set of numbers called an IP (Internet Protocol) address. The reason we use domain names instead of IP addresses is that they are closer to our language. It would be difficult to market a site like this: "Go to 18.104.22.168 or 22.214.171.124 to search the internet!" A much easier way to do this is to say "Go to www.Google.com or www.yahoo.com to search the internet!" (Both Google and Yahoo are trade marked by Google, Inc., and Yahoo, Inc., respectively).