The Name Servers of a domain name show the DNS servers that handle its DNS records. The Internet protocol address of the web site (A record), the mail server that deals with the emails for a domain name (MX records), any text record in free form (TXT record), pointing (CNAME record) etc are extracted from the DNS servers of the web hosting company and for any Internet domain to be using them and to be directed to their hosting platform, it ought to have their name servers, or NS records. If you wish to open a website, for instance, and you insert the URL, the web browser connects to a DNS server, which keeps the NS records for the domain name and the request is then forwarded to the DNS servers of the webhosting provider where the A record of the site is obtained, so that you can view the content from the proper location. Usually a domain address has 2 name servers that start with NS or DNS as a prefix and the difference between the two is just visual.