DNS is a globally distributed service that translates human-readable names like www.example.com into the numeric IP addresses like 192.0.2.1 that computers use to connect to each other.
The Internet’s DNS system works much like a phone book by managing the mapping between names and numbers. For DNS, the names are domain names (www.example.com) that are easy for people to remember and the numbers are IP addresses (192.0.2.1) that specify the location of computers on the Internet. DNS servers translate requests for names into IP addresses, controlling which server an end user will reach when they type a domain name into their web browser.