What is DNS?

The Internet Domain Name System (DNS) is a set of distributed databases containing IP addresses and their corresponding domain names. Each domain name is mapped to a particular numeric address. DNS, with servers located all over the Internet, performs the translation back and forth between names and numbers.

This scheme enables users to invoke an easy-to-remember name (e.g. www.nic.sa) instead of a more mysterious string of numbers (e.g. when using the Internet.