The Domain Name System (DNS) helps users to find their way around the Internet. Every computer on the Internet has a unique address – just like a telephone number – which is a rather complicated string of numbers. It is called its “IP address” (IP stands for “Internet Protocol”). IP Addresses are hard to remember. The DNS makes using the Internet easier by allowing a familiar string of letters (the “domain name”) to be used instead of the arcane IP address. So instead of typing 207.151.159.3, people can type www.internic.net. It is a “mnemonic” device that makes addresses easier to remember.
The Internet domain name system (DNS) consists of a directory, organized hierarchically, of all the domain names and their corresponding computers registered to particular companies and persons using the Internet. When someone registers a domain name, it will be associated with the computer on the Internet he/she designates during the period the registration is in effect. From that computer, people can create a website which will be accessible to Internet users around the world.