The Name Servers of a domain name reveal the DNS servers that manage its DNS records. The Internet protocol address of the web site (A record), the mail server that takes care of the e-mails for a domain name (MX records), any text record in free form (TXT record), forwarding (CNAME record) etc are obtained from the DNS servers of the hosting company and for any Internet domain to be using them and to be pointed to their hosting platform, it ought to have their name servers, or NS records. If you wish 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 name and the request is then pointed to the DNS servers of the webhosting provider where the A record of the site is retrieved, so that you can look at the content from the correct location. Ordinarily a domain address has a couple of name servers that start with NS or DNS as a prefix and the distinction between the two is only visual.