The Name Servers of a domain name show 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 (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 domain address to be using them and to be forwarded to their hosting platform, it has to have their name servers, or NS records. If you want to open a site, for example, and you enter the URL, the Internet browser connects to a DNS server, which keeps the NS records for the domain and the request is then pointed to the DNS servers of the hosting provider where the A record of the site is retrieved, so you can look at the content from the proper location. Ordinarily a domain address has 2 name servers that start with NS or DNS as a prefix and the distinction between the two is only visual.