The Name Servers of a domain name point out the DNS servers that handle its DNS records. The IP of the web site (A record), the mail server that manages the e-mails for a domain address (MX records), any text record in free form (TXT record), pointing (CNAME record) and so on are extracted from the DNS servers of the web hosting company and for any domain name to be using them and to be directed to their hosting platform, it has to have their name servers, or NS records. If you wish to open a website, for example, and you type in the URL, the Internet browser connects to a DNS server, which keeps the NS records for the domain address and the request is then pointed to the DNS servers of the hosting provider where the A record of the website is retrieved, enabling you to view the content from the right location. Ordinarily a domain address has 2 name servers that start with NS or DNS as a prefix and the distinction between the two is simply visual.