What is a name server?
A name server is a program that listens for and answers requests for domain name information. When it is registered, each domain name must be associated with a minimum of two name servers (primary and secondary) and a maximum of thirteen.
Name servers are typically of the format "ns1.domain.com". By default (unless you set them otherwise), we set your name servers to be ns1.registry-server.com (primary) and be ns2.registy-server.com (secondary).