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 host company for your domain address is the most effective way to direct it to their system and all its sub-records will be taken care of on their end. This includes A (the IP address of the server/website), MX (mail server), TXT (free text), SRV (services), CNAME (forwarding), etcetera, so if you wish to edit any of these records, you will be able to do it by using their system. Put simply, the NS records of a domain 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 Internet domain you want to access. This way the site you will see is going to be retrieved from the proper location. The name servers typically have a prefix “ns” or “dns” and each domain address has at least 2 NS records. There's no functional difference between the two prefixes, so what type a website hosting provider will use depends only on their preference.