What Is The Domain Name System (DNS)?

The domain name system (DNS) enables each machine connected to the Internet to be recognized by a domain name. Every computer on the Internet has a unique IP (Internet protocol) address which consists of a string of numbers (123.45.67.890). Since the IP addresses can be difficult to remember, the DNS allows a familiar string of letters (the "domain name") to be used instead of the IP address. So instead of typing the IP address' arcane string of numbers you can type, for example, "www.google.ca."

Put simply, DNS is like the phone book of the Internet. You look up a name (domain name), and it give you a number (IP address).
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