Domain Name servers (Nameservers look like ns1.pakishhosting.com , ns2.pakishhosting.com etc ) , special computers accessible on the Internet, tell to your domain ( your website name look like www.pakish.pk ) where a web page or website is located. Domain Nameservers are guide your domain for resolving, a special procedure in which a domain name matching your website is taken and a physical address is obtained.

For more details about  Domain Name servers click below link and read full article on wikiPedia

http://en.wikipedia.org/wiki/Name_server