What is DNS? Why do we use it?
Internet service that maps Internet domains into corresponding IP addresses. DNS database is distributed and replicated among many DNS servers, so when you change your domain's IP address, the changes take a while to propagate.
Computers have no problems with locating and remembering numeric addresses. In contrast, most humans have trouble remembering long complicated sequences of numbers. So, to make surfing the web easier, the domain name system was invented. This system allows people to use easy to remember names for websites instead of those number sequences.