Domain name is an identification string that defines a realm of administrative autonomy, authority, or control on the Internet. Domain names are formed by the rules and procedures of the Domain Name System (DNS). Domain names are used in various networking contexts and application-specific naming and addressing purposes. In general, a domain name represents an Internet Protocol (IP) resource, such as a personal computer used to access the Internet, a server computer hosting a web site, or the web site itself or any other service communicated via the Internet. The most popular domain extensions on the web - .COM, .NET, .INFO, .ORG, .BIZ, .NAME, .MOBI, etc. They are all known as generic top-level domains (gTLDs) and are open for registration to all users worldwide, regardless of their sitizenship, residence or age.