What is the Domain Name System (DNS)?

The Domain Name System (DNS) is the protocol computer networks use to identify domain names and translate them into Internet Protocol (IP) addresses.

For example, DNS turns a user-friendly domain name, like, into a corresponding IP address, such as It works in the same way that a phone book maps names to phone numbers. 

DNS also stores other information, such as a list of mail exchange servers that accept email for a given domain and authentication text such as for a Sender Policy Framework (SPF) record.

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