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DNS is a protocol that allows you to associate a domain name ,to an IP address.

How does DNS work ?

When a user types a Domain Name in his browser, in the first the computer contacts a local DNS server requesting the IP address of the domain name . If the local server cannot find the requested IP address: : The DNS server in turn may contact other DNS servers on the Internet, which it will return the IP address of the server name requested.

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DNS hmm now i got many a times i got trap, when my system check network error it check for some kind of DNS.. now it got.. thanks for the information.

You can find a very simple answer if you google it, just typed "what is dns" and foundhttp://what-is-dns.com this would help to start.