DNS stands for Domain Name System, an Internet service that 
translates domain names into IP addressess. Because domain 
names are alphabetic, they're easier to remember.  The 
Internet however, is really based on IP addresses.  Every 
time you use a domain name, therefore a DNS service must 
translate the name into the corresponding IP address. For 
example, the domain name www.sudheer.com might translate to 
192.168.252.101.