The Name Servers of a domain name point out the DNS servers that are responsible for 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), directing (CNAME record) and so forth are obtained from the DNS servers of the web hosting company and for any domain name to be using them and to be directed to their hosting platform, it needs to have their name servers, or NS records. If you would like to open an Internet site, for instance, and you enter the URL, the web browser connects to a DNS server, which keeps the NS records for the domain name and the request is then redirected 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. Normally a domain has 2 name servers that start with NS or DNS as a prefix and the distinction between the two is just visual.