The Name Servers of a domain reveal the DNS servers that manage its DNS records. The IP of the site (A record), the mail server that handles the e-mails for a domain name (MX records), any text record in free form (TXT record), directing (CNAME record) and so on are extracted from the DNS servers of the hosting company and for any Internet domain to be using them and to be pointed to their hosting platform, it ought to have their name servers, or NS records. If you wish to open an Internet site, for instance, and you type in the URL, the Internet browser connects to a DNS server, which keeps the NS records for the domain and the request is then pointed to the DNS servers of the webhosting provider where the A record of the site is retrieved, allowing you to look at the content from the proper location. Ordinarily a domain address has a couple of name servers that start with NS or DNS as a prefix and the distinction between the two is just visual.