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 given host company for your domain name is the simplest way to forward it to their system and all its sub-records are going to 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 want to change some of these records, you will be able to do it by using their system. In other words, the NS records of a domain address reveal the DNS servers which are authoritative for it, so when you try to open a web address, the DNS servers are contacted to obtain the DNS records of the domain name you are attempting to access. That way the website you will see will 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 2 NS records. There isn't any practical difference between the two prefixes, so what type a website hosting provider is going to use depends completely on their preference.