Lets see what is mean by Root Servers
They are part of the Domain Name System (DNS).
The root zone file describes where the authoritative servers for the DNS top-level domains (TLD) are located; in other words: which server one has to ask for names ending in one of TLDs, such as ORG, NET, NL or AU.
There are 13 root servers at present – or, more accurately, there are 13 addresses on the Internet where root servers can be found (the servers that have one of the 13 addresses can be in dozens of different physical locations).
These servers all stores a copy of the same file which lists an address for each top-level domain (.com, .de, etc) where that registry’s own address book can be found.
For more details visit :-
http://linuxtric.blogspot.in/2013/02/root-name-servers.html
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