The Name Servers of a domain show the DNS servers that are responsible for its DNS records. The Internet protocol address of the site (A record), the mail server that manages the emails for a domain (MX records), any text record in free form (TXT record), pointing (CNAME record) and so on are extracted from the DNS servers of the website hosting provider and for any Internet domain to be using them and to be pointed to their hosting platform, it has to have their name servers, or NS records. If you want to open an Internet site, for example, and you input the URL, the web 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 site is obtained, enabling you to view the content from the correct location. Usually a domain address has 2 name servers that start with NS or DNS as a prefix and the distinction between the two is simply visual.