The Name Servers of a domain name reveal the DNS servers that manage its DNS records. The IP of the web site (A record), the mail server that handles the e-mails for a domain (MX records), any text record in free form (TXT record), pointing (CNAME record) and so forth are obtained from the DNS servers of the website hosting provider and for any domain name to be using them and to be pointed to their hosting platform, it ought to have their name servers, or NS records. If you would like to open a website, for instance, and you input the URL, the Internet browser connects to a DNS server, which keeps the NS records for the domain and the request is then redirected to the DNS servers of the hosting company where the A record of the site is retrieved, enabling you to view the content from the right location. Ordinarily a domain name has two name servers that start with NS or DNS as a prefix and the difference between the two is only visual.