The Name Servers of a domain point out the DNS servers that deal with its DNS records. The IP of the website (A record), the mail server that handles the emails for a domain (MX records), any text record in free form (TXT record), forwarding (CNAME record) and so forth are obtained from the DNS servers of the web hosting company and for any Internet domain to be using them and to be forwarded to their hosting platform, it ought to have their name servers, or NS records. If you want to open an Internet site, for example, and you type in the URL, the web browser connects to a DNS server, which keeps the NS records for the domain address and the request is then sent to the DNS servers of the hosting company where the A record of the web site is obtained, allowing you to view the content from the right location. Normally a domain address has two name servers that start with NS or DNS as a prefix and the distinction between the two is only visual.