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 takes care of the e-mails for a domain name (MX records), any text record in free form (TXT record), forwarding (CNAME record) and so on are obtained from the DNS servers of the hosting provider and for any domain address to be using them and to be forwarded to their hosting platform, it should have their name servers, or NS records. If you wish to open a website, for instance, and you enter the URL, the web browser connects to a DNS server, which keeps the NS records for the domain and the request is then forwarded to the DNS servers of the webhosting provider where the A record of the site is obtained, allowing you to look at the content from the proper location. Ordinarily a domain has 2 name servers that start with NS or DNS as a prefix and the contrast between the two is only visual.