A domain name is an identification string that defines a realm of administrative autonomy, authority or control within the Internet. Domain names are formed by the rules and procedures of the Domain Name System (DNS). Any name registered in the DNS is a domain name.
There are many websites where you can buy domain names and sell domain names. The most popular ones are as follows:
GoDaddy is the world's largest domain name registrar, which makes registering Domain Names fast, simple, and affordable.