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Server is a computer system that provides a specific service type within a computer network. Servers are supported with processors that are scalable and large RAM, also equipped with a special operating system, called the network operating system or network operating system. Server is also running administrative software that controls access to networks and resources contained in it, like a file or printer device (printer), and provide access to the workstation network members.
Type Server
1. Application Server (Application server)
2. Server Data (Data Server)
3. Proxy Server (Proxy Server).

Server function
1. Application Servers 
Server used to store various kinds of applications that can be accessed by the client, the server data itself is used to store data that is used either directly or client data that is processed by the server application.
2. Proxy Server 
Serves to regulate traffic on the network through proxy settings. People are more familiar with the proxy server to connect client computers to the Internet.

although a bit hopefully my post useful, maybe the next post I will discuss more details about the computer server. thank you