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DNS is the acronym for Domain Name System. It’s a way of mapping domain names to IP addresses. The IP address is a number that’s assigned to each device that connects to the Internet. When you type in a domain name, your computer sends a request to the DNS server, which looks up the corresponding IP address. The DNS server then returns a response that includes the domain name and an associated IP address. This process is called name resolution. DNS is used by most websites and services that use the Internet. It’s also used by email services like Gmail and Yahoo Mail, as well as by many online services like shopping sites and online banking services.