The Name Servers of a domain name reveal the DNS servers that are responsible for its DNS records. The Internet protocol address of the web site (A record), the mail server that manages 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 hosting company and for any domain address to be using them and to be directed to their hosting platform, it should have their name servers, or NS records. If you want to open a website, for instance, and you enter the URL, the web browser connects to a DNS server, which keeps the NS records for the domain name and the request is then pointed to the DNS servers of the webhosting provider where the A record of the website is obtained, so that you can look at the content from the correct location. Commonly a domain address has two name servers that start with NS or DNS as a prefix and the difference between the two is only visual.