A name server is a server that hosts a network service for providing responses to queries against a directory service. It maps a human-recognizable identifier to a system-internal, identification or addressing component, the program BIND is the most famous name server available on Linux, it can be used to do everything you need from a name server, but sometimes you need less. Maybe you have a VPS and you want just to manage your DNS name, for this use you could check NSD a great alternative to BIND, it does not do DNS forwarding, it only serves its own domains. but this could be enough for your project.