What Is a Domain Name System (DNS)?
A Domain Name System (DNS) is like a phone book for the Internet. It keeps track of domain names (the part of a web address that comes after “www.”) and the long string of numbers (called an “IP address”) associated with that website.
Without DNS services, you’d need to type something like 172.16.254.1 every time you want to go to a particular website. Instead, you can just type the easier-to-remember website name.