The NS, or Name Server records of a domain name, show which servers handle the Domain Name System (DNS) records for it. Setting the name servers of a specific host company for your domain is the most convenient 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), etcetera, so if you would like to edit any one of these records, you're going to be able to do it using their system. Put simply, the NS records of a domain name point out the DNS servers which 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 trying to access. In this way the site that you will see will be retrieved from the proper location. The name servers normally have a prefix “ns” or “dns” and every single domain has at least 2 NS records. There is no functional difference between the two prefixes, so what type a host company will use depends solely on their preference.