The Name Servers of a domain name show the DNS servers that are responsible for its DNS records. The IP address 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), forwarding (CNAME record) and so forth are extracted from the DNS servers of the web hosting company 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 want to open a site, for instance, and you insert the URL, the browser connects to a DNS server, which keeps the NS records for the domain and the request is then sent to the DNS servers of the hosting provider where the A record of the website is obtained, allowing you to look at the content from the correct location. Normally a domain has two name servers that start with NS or DNS as a prefix and the difference between the two is only visual.