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 name is the most convenient way to forward it to their system and all its sub-records are going to be managed 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 wish to edit any one of these records, you will be able to do it using their system. In other words, the NS records of a domain address reveal the DNS servers that 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 domain you are trying to reach. In this way the web site that you will see will be retrieved from the right location. The name servers usually have a prefix “ns” or “dns” and every single domain name has at least two NS records. There is absolutely no practical difference between the two prefixes, so which one a hosting provider is going to use depends completely on their preference.