The Name Servers of a domain name show the DNS servers that handle its DNS records. The IP address of the web site (A record), the mail server that takes care of the e-mails for a domain name (MX records), any text record in free form (TXT record), pointing (CNAME record) and so forth are extracted from the DNS servers of the web hosting provider and for any domain address to be using them and to be pointed to their hosting platform, it needs to have their name servers, or NS records. If you want to open an Internet 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 redirected to the DNS servers of the hosting provider where the A record of the website is obtained, so you can see the content from the proper location. Normally a domain has two name servers that start with NS or DNS as a prefix and the distinction between the two is only visual.