Domain names are, strictly speaking, not necessary for the functioning of the Internet. If all the domain names tomorrow disappeared overnight, it would still be possible for computers to talk to computers, by means of their IP address.
Choosing a Domain Name
When you create a website, it’s not enough to have a good name. You also need a good domain. A domain is the name users will type to get to your site - like yahoo.com, redcross.org, or whitehouse.gov.
Registering a Domain
If you want to find out whether the domain you want is available, don’t just type your preferred name into a web browser. Even if no website appears, the domain name may already be taken.