The NS, or Name Server records of a domain, point out which servers handle the Domain Name System (DNS) records for it. Setting the name servers of a given hosting provider for your domain name is the most effective way to forward it to their system and all its sub-records are going to 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 wish to change some of these records, you are going to be able to do it via their system. To put it differently, the NS records of a domain address show the DNS servers which are authoritative for it, so when you attempt to open a web address, the DNS servers are contacted to get the DNS records of the domain you are attempting to reach. This way the site you will see is going to be retrieved from the right location. The name servers typically have a prefix “ns” or “dns” and each and every domain has at least 2 NS records. There isn't any practical difference between the two prefixes, so what kind a web hosting provider will use depends only on their preference.