Nameserver is a server on the internet specialized in handling queries regarding the location of a domain name’s various services. Nameservers are a fundamental part of the Domain Name System (DNS). They allow using domains instead of IP addresses.
Nameservers are the Internet’s equivalent to phone books. A nameserver maintains a directory of domain names that match certain IP addresses (computers). The information from all the nameservers across the Internet is gathered in a central registry.
Nameservers make it possible for visitors to access your website using a familiar domain name, instead of having to remember a series of numbers.