Understanding what DNS actually is.
The "Domain Name System" or DNS is a system that stores information about hostnames and domain names on networks, such as the Internet. Most importantly, it provides an IP address for each hostname, and lists the mail exchange servers accepting e-mail for each domain.
The DNS forms a vital part of the Internet because hardware requires IP addresses to perform routing, but humans use hostnames and domain names, for example in URLs and e-mail addresses.
Paul Mockapetris invented the DNS in 1983; the original specifications appear in RFC 882. In 1987 the publication of RFC 1034 and RFC 1035 updated the DNS specification and made RFC 882 and RFC.