DNS stands for Domain Name System. It helps correlating a user-friendly
name to IP address. If DNS was not present, we should be memorizing the IP
address of each host – which is impossible. DNS converts IP addresses to easy
to remember texts – which we call hostnames. When you type this text into a web
browser or if you try to send an e-mail, this request is relayed to a name
server which looks up for the IP address of the web server.
How Does DNS Work?