The NS, or Name Server records of a domain name, point out which servers handle the Domain Name System (DNS) records for it. Setting the name servers of a particular hosting provider for your domain name is the most effective way to point 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), etc, so, in case you want to modify some of these records, you will be able to do it via their system. In other words, the NS records of a domain name point out the DNS servers that 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 reach. That way the website you will see is going to be retrieved from the proper location. The name servers typically have a prefix “ns” or “dns” and every single domain name has at least two NS records. There is no sensible difference between the two prefixes, so what kind a web hosting provider will use depends only on their preference.