The NS, or Name Server records of a domain, point out which servers handle the Domain Name System (DNS) records for it. Setting the name servers of a given hosting provider for your domain address is the most effective way to point it to their system and all its sub-records will 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 forth, if you want to edit any of these records, you are going to be able to do it by using 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 obtain the DNS records of the domain you are trying to reach. This way the website that you will see will be retrieved from the proper location. The name servers usually have a prefix “ns” or “dns” and each and every domain address has at least two NS records. There isn't any functional difference between the two prefixes, so which one a web hosting provider will use depends completely on their preference.