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 address is the simplest way to forward it to their system and all its sub-records will be handled 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, in case you need to edit some of these records, you're going to be able to do it via their system. Put simply, the NS records of a domain show 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 domain you are trying to reach. That way the website that you'll see is going to 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's no sensible difference between the two prefixes, so what kind a website hosting provider is going to use depends entirely on their preference.