The Name Servers of a domain point out the DNS servers that manage its DNS records. The Internet protocol address of the site (A record), the mail server that takes care of the emails for a domain (MX records), any text record in free form (TXT record), directing (CNAME record) etc are extracted from the DNS servers of the hosting company and for any Internet domain to be using them and to be forwarded to their hosting platform, it has to have their name servers, or NS records. If you would like to open a website, for example, and you enter the URL, the 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 correct location. Normally a domain name has two name servers that start with NS or DNS as a prefix and the contrast between the two is only visual.