The Name Servers of a domain name point out the DNS servers that deal with its DNS records. The Internet protocol address of the site (A record), the mail server that manages the e-mails for a domain name (MX records), any text record in free form (TXT record), forwarding (CNAME record) and so on are obtained from the DNS servers of the web 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 would like to open a website, for example, and you input the URL, the Internet browser connects to a DNS server, which keeps the NS records for the domain name and the request is then forwarded to the DNS servers of the hosting provider where the A record of the site is obtained, so that you can see the content from the right location. Ordinarily a domain has a couple of name servers that start with NS or DNS as a prefix and the distinction between the two is only visual.