A server system is a type of computer system that provides services to other computers or devices on a network. The most common type of server system is the UNIX system, which is an operating system that is used to manage computer resources and provide services to other computers. UNIX is a multi-user, multitasking operating system that is designed to be reliable, secure, and efficient. It is used in many different types of applications, from web servers to enterprise systems. UNIX is also used for networking, file sharing, and other tasks.