Name server (nameserver) is combination of software program and hardware device which implements a name-service protocol. It maps a human-recognizable domain names to a system-internal, numeric identification.

The most widely used types of name servers are those of the Domain Name System (DNS). The most important function of the DNS servers is to translate (resolve) of domain names and hostnames into Internet Protocol (IP) addresses, which are the second principal Internet name space, used to identify and locate network device, server or computer on the Internet.

Container is a term that describes an isolated IT hosting environment which runs its own Operating System (OS) alone, which might or might not be a different type of OS than the one of the underlying physical server (infrastructure). Unlike the other Virtual Servers (Virtual Machines), the so-called Containers are created through a virtualization technique called OS Virtualization. It is a software assisted virtualization, which allows any computer hardware to run multiple instances with separate OS concurrently.

The instances (VEs), also containers, work like a separate, real computers. Any software application running on a standard  Operating System can use all resources – CPU power, memory and other computing resources as well as files and folders – of a Container based computer.

Containers crated thought an OS Operating virtualization does not feature the same level of flexibility as the Virtual Machines created with full virtualization, for example. A Container cannot use an OS different from the one that runs on the underlying physical server, or a different guest kernel. If the underlying host runs any Linux distribution, the Containers that run on top of it cannot run Windows.