The Name Servers of a domain name point out the DNS servers that are responsible for its DNS records. The IP address of the site (A record), the mail server that handles the e-mails for a domain name (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 Internet domain to be using them and to be pointed to their hosting platform, it has to have their name servers, or NS records. If you want to open an Internet site, for example, 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 redirected to the DNS servers of the webhosting provider where the A record of the website is retrieved, so you can view the content from the right location. Normally a domain has 2 name servers that start with NS or DNS as a prefix and the distinction between the two is just visual.