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 specific host company for your domain is the easiest 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), and so forth, if you would like to modify some of these records, you're going to be able to do it through their system. To put it differently, the NS records of a domain address reveal 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 Internet domain you are attempting to reach. In this way the website 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 name has at least two NS records. There isn't any sensible difference between the two prefixes, so what type a host company is going to use depends exclusively on their preference.