The Name Servers of a domain reveal the DNS servers that manage its DNS records. The Internet protocol address of the web site (A record), the mail server that manages the emails for a domain name (MX records), any text record in free form (TXT record), directing (CNAME record) and so on are extracted from the DNS servers of the website hosting provider and for any Internet domain to be using them and to be forwarded to their hosting platform, it needs to have their name servers, or NS records. If you want to open a website, 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 hosting provider where the A record of the website is obtained, so you can view the content from the correct location. Normally a domain has two name servers that start with NS or DNS as a prefix and the contrast between the two is only visual.