The NS, or Name Server records of a domain name, point out which servers handle the Domain Name System (DNS) records for it. Setting the name servers of a specific hosting provider for your domain address is the simplest 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), and so forth, so if you want to modify some of these records, you are going to be able to do it via their system. In other words, the NS records of a domain address reveal the DNS servers that 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 want to reach. In this way the website you'll see is going to 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 2 NS records. There is absolutely no practical difference between the two prefixes, so which one a website hosting provider will use depends exclusively on their preference.