Domain Name System (DNS)
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When you hear a commercial asking you to visit www.somesite.com or www.yoursite.net (and you actually do so), you are certainly not using the IP address of the website in question. So how are we able to access websites and other services using friendly, English names rather than their IP addresses?
When you type a web address into your web browser (or indeed access any resource by its English name), the network stack213 on your machine sends a query to a computer running a Domain Name Service (DNS) server to look up (resolve) the human friendly domain name and find out what the network friendly IP address for that site is. This human friendly name is known as the FQDN, or Fully Qualified Domain Name.
213. The network stack is the generic name used to refer to the combination of operating system functions, protocol software and network card drivers
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