The Name Servers of a domain name reveal the DNS servers that deal with its DNS records. The Internet protocol address of the website (A record), the mail server that takes care of the e-mails for a domain name (MX records), any text record in free form (TXT record), directing (CNAME record) and so forth are taken from the DNS servers of the hosting provider and for any domain name to be using them and to be forwarded to their hosting platform, it has to have their name servers, or NS records. If you want to open an Internet site, for example, and you type in the URL, the browser connects to a DNS server, which keeps the NS records for the domain and the request is then forwarded to the DNS servers of the hosting company where the A record of the site is obtained, so that you can look at the content from the proper location. Commonly a domain has two name servers that start with NS or DNS as a prefix and the difference between the two is simply visual.