The full form of DNS is Domain Name System. It is associated with the Internet. It is based on the Internet Protocol (IP) system. DNS servers are needed for the working of DNS. With the help of a look-up table, the IP address is determined. Every computer system or website has a unique IP address. It is a long numeric code. DNS is an IP service which translates the domain name into a unique IP address. DNS is alphabetic and therefore, easy to remember.