The NS, or Name Server records of a domain, show which servers manage the Domain Name System (DNS) records for it. Setting the name servers of a given host company for your domain is the most effective 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), etcetera, if you would like to edit some of these records, you will be able to do it through their system. Put simply, the NS records of a domain address reveal the DNS servers that are authoritative for it, so when you try to open a web address, the DNS servers are contacted to obtain the DNS records of the domain you are trying to access. In this way the site you will see will be retrieved from the proper location. The name servers normally have a prefix “ns” or “dns” and each domain has at least two NS records. There is absolutely no practical difference between the two prefixes, so what type a hosting provider is going to use depends completely on their preference.