The Name Servers of a domain point out the DNS servers that manage its DNS records. The IP address of the web site (A record), the mail server that handles the e-mails for a domain address (MX records), any text record in free form (TXT record), directing (CNAME record) and so forth are extracted from the DNS servers of the website hosting provider and for any domain name to be using them and to be forwarded to their hosting platform, it should have their name servers, or NS records. If you want to open an Internet site, for instance, and you enter the URL, the Internet browser connects to a DNS server, which keeps the NS records for the domain name and the request is then sent to the DNS servers of the hosting company where the A record of the website is retrieved, allowing you to view the content from the right location. Normally a domain has two name servers that start with NS or DNS as a prefix and the distinction between the two is simply visual.