What is DNS?
The Domain Name System, or DNS, is a core function of the Internet. DNS is used to resolve human-readable hostnames into IP addresses, such as resolving 'www.expresshostpro.com' to '63.208.196.99', and also stores other information about domains, such as the location of mailservers. DNS is used whenever you resolve a hostname, whether you are visiting a website, accessing an FTP server, sending email, or any other Internet service.