The NS, or Name Server records of a domain name, point out which servers deal with the Domain Name System (DNS) records for it. Setting the name servers of a particular hosting provider for your domain is the most effective way to direct it to their system and all its sub-records will be taken care of on their end. This includes A (the IP address of the server/website), MX (mail server), TXT (free text), SRV (services), CNAME (forwarding), and so on, so if you would like to modify any one of these records, you are going to be able to do it by using their system. In other words, the NS records of a domain address show the DNS servers which are authoritative for it, so when you attempt to open a web address, the DNS servers are contacted to obtain the DNS records of the Internet domain you are trying to access. In this way the site that you'll see will be retrieved from the proper location. The name servers normally have a prefix “ns” or “dns” and each and every domain name has at least 2 NS records. There isn't any practical difference between the two prefixes, so what type a hosting provider will use depends entirely on their preference.