Domain Name System is responsible for the allocation of domain names and traffic direction based on URLs in the address bar of the web browser. The Domain Name System is the largest database in the world, containing information about every web site in existence. There are currently more than 350 million unique active domains on the Internet.
Web sites are identified by the IP address of their server and/or server partition. However, an IP address is a number, which is far more difficult to remember than a simple phrase. In order to convert the IP address of a web site into a memorable phrase that is the domain name, a DNS server is needed.