Domain Names are web addresses, identification labels which defines an administrative autonomy, authority, or control in the Internet.

A Domain name is also hostname which identifies Internet Protocol (IP) resources such as web sites. Domain names are formed by the rules and procedures of the Domain Name System (DNS). They are used in various networking contexts and application-specific naming and addressing purposes. Domains are organized in subordinate levels (subdomains) of the DNS root domain, which is nameless.

The first-level set of domain names are the Top-level domains (TLDs), including the generic top-level domains (gTLDs), such as .COM, .NET and .ORG, and the country code Top-level domains (ccTLDs).

There are second-level and third-level domain names in the DNS hierarchy which are open for reservation by end-users as well.

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.