The Name Servers of a domain show the DNS servers that deal with its DNS records. The Internet protocol address of the site (A record), the mail server that deals with the emails for a domain address (MX records), any text record in free form (TXT record), pointing (CNAME record) and so forth are extracted from the DNS servers of the website hosting company and for any Internet domain to be using them and to be directed to their hosting platform, it needs to have their name servers, or NS records. If you wish to open an Internet site, for example, and you input 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 webhosting provider where the A record of the web site is retrieved, enabling you to see the content from the proper location. Normally a domain has 2 name servers that start with NS or DNS as a prefix and the contrast between the two is just visual.