The Name Servers of a domain point out the DNS servers that deal with its DNS records. The IP address of the web site (A record), the mail server that takes care of 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 hosting company and for any domain name to be using them and to be forwarded to their hosting platform, it needs to have their name servers, or NS records. If you would like to open a site, for example, and you input the URL, the Internet browser connects to a DNS server, which keeps the NS records for the domain address and the request is then redirected to the DNS servers of the hosting provider where the A record of the site is obtained, enabling you to view the content from the right location. Ordinarily 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.