An Operating system (OS) is a set of programs containing instructions that coordinate all of the activities among computer hardware resources.
Ex: - The OS recognizes input from an input device such as keyboard, mouse or microphone, coordinates the display of output on the monitor, instructs a printer how and when to print information; and manages data, instructions and information stored on disk. A computer cannot not function without an operating system
Function of an OS
- Memory management, Optimize use of ram.
- Spooling print jobs
- Configuring devices
- Monitoring system performance
- Administering security
Different types of operating systems
Microsoft: - Windows 7, Windows Vista, Windows XP
MAC: - OS X Snow leopard, Mac OS X Public Beta, Mac OS X 10.x
Open source:- Linux, Red Hat, Ubantu
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