The NS, or Name Server records of a domain name, point out which servers manage the Domain Name System (DNS) records for it. Setting the name servers of a given hosting provider for your domain name is the most convenient way to direct it to their system and all its sub-records are going to be handled 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 forth, if you would like to change some of these records, you are going to be able to do it through their system. In other words, the NS records of a domain address show the DNS servers that are authoritative for it, so when you attempt to open a web address, the DNS servers are contacted to get the DNS records of the domain name you want to access. In this way the site you will see is going to be retrieved from the proper location. The name servers normally have a prefix “ns” or “dns” and every single domain name has at least 2 NS records. There's no functional difference between the two prefixes, so what kind a host company is going to use depends solely on their preference.