Understanding Windows Server

What is your answer if someone asks you, What is Windows Server? I am sure you will answer that it is Microsoft's NOS for servers. In general, when talking about servers, whether it is a server that runs on Windows, Linux, or macOS it still does not make any difference as it continues to be a server that provides network services. But, when talking about how to deploy a server, the user interface, managing resources, and maintaining a server, then the differences are obvious.