Millions of websites are available over Internet so that our website must be registered with a suitable name. Domain Name registration is used to identify a website over Internet. A domain name must be unique(i.e. no two websites with same name is available). 

So you have to check the availability of domain name before you register it, for this WWW.Whois.net website will help. If the domain name entered is available then we can register it by paying the Annual registration fees online. Consider a Post Oce, it has two addresses one string address (Irinjalakuda) and one numeric(pin) code (680121). 

Just like this the website has also two addresses a string address, for example, www.agker.cag.gov.in and a numeric address (http:/ /210.212.239.70/). We are following string address, hence this domain name has to be connected to the corresponding IP address of the webserver. This is done by using ‘A record’(Address record) of the domain. ‘A record’ is used to store the IP address and the corresponding domain name.