The Name Servers of a domain reveal the DNS servers that are responsible for its DNS records. The Internet protocol address of the website (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 forth are taken from the DNS servers of the web hosting company and for any Internet domain to be using them and to be directed to their hosting platform, it should have their name servers, or NS records. If you want to open an Internet site, for example, and you insert the URL, the browser connects to a DNS server, which keeps the NS records for the domain address and the request is then pointed to the DNS servers of the hosting company where the A record of the web site is obtained, enabling you to see the content from the correct location. Usually a domain has 2 name servers that start with NS or DNS as a prefix and the distinction between the two is just visual.