DEFINITION OF OPERATING SYSTEM

consists of the programs that control or maintain the operations of the computer and its devices.

TYPES OF OPERATING SYSTEM

Stand alone operating system	a complete operating system that works on a desktop computer, notebook computer, or mobile computing device
mobile operating system	A complete operating system that works on mobile devices.
Server operating system	A server operating system typically resides on a server. The client computers on the network rely on the server(s) for resources.

FUNCTION OF OPERATING SYSTEM

Provide user interface
Starting and Shutting Down a Computer
Establishing an Internet Connection
Managing Memory
Establishes an Internet connection