The NS, or Name Server records of a domain name, reveal which servers handle the Domain Name System (DNS) records for it. Setting the name servers of a specific host company for your domain name is the simplest 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), etc, if you want to change some 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 reveal the DNS servers that are authoritative for it, so when you attempt to open a web address, the DNS servers are contacted to get the DNS records of the domain you are attempting to access. In this way the web site you will see is going to be retrieved from the proper location. The name servers usually have a prefix “ns” or “dns” and every single domain address has at least 2 NS records. There is no functional difference between the two prefixes, so which one a website hosting provider will use depends exclusively on their preference.