a server is a computer that serves many kinds of information to a user or client machine. ... A server can also host internet games, share files, and give access to peripheral equipment such as printers. In simple words, the individual computers are connected to some powerful computers called servers.
Below are the most common server types.
Application Servers.
Client Servers.
Collaboration Servers.
FTP Servers.
List Servers.
Mail Servers.
Open Source Servers.
Proxy Servers.