The NS, or Name Server records of a domain name, reveal which servers deal with the Domain Name System (DNS) records for it. Setting the name servers of a particular hosting provider for your domain address is the most convenient way to point it to their system and all its sub-records will 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), etc, so, in case you need to change any one of these records, you will be able to do it using their system. Put simply, the NS records of a domain address point out the DNS servers which are authoritative for it, so when you attempt to open a web address, the DNS servers are contacted to retrieve the DNS records of the Internet domain you are attempting to access. That way the website that you will see is going to be retrieved from the right location. The name servers typically have a prefix “ns” or “dns” and each and every domain has at least 2 NS records. There is no functional difference between the two prefixes, so which one a host company is going to use depends only on their preference.