The NS, or Name Server records of a domain name, point out which servers manage the Domain Name System (DNS) records for it. Setting the name servers of a particular host company for your domain address is the easiest way to direct it to their system and all its sub-records are going to 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 on, so if you would like to change any one of these records, you will be able to do it via their system. In other words, the NS records of a domain show the DNS servers that are authoritative for it, so when you try to open a web address, the DNS servers are contacted to retrieve the DNS records of the domain name you want to reach. This way the site that you'll see is going to be retrieved from the correct location. The name servers usually have a prefix “ns” or “dns” and each and every domain address has at least two NS records. There is no sensible difference between the two prefixes, so which one a web hosting provider is going to use depends exclusively on their preference.