COMPUTER AND MOBILE OPERATING SYSTEM OS

# OPERATING SYSTEM or OS is the main program or the software which acts as an interface between the user and the computer components.

# Operating system is a set of programs which control and coordinate the processes of the computer device.

# Manages the hardware and the application software.


FUNCTIONS

• Abstraction
• Easy availability of resources
• Pleasant user interface
• Speed 
• Accuracy
• Memory
• File manager

EXAMPLES

• MS-DOS
• Windows
• UNIX
• LINUX
• Lynx

MOBILE OPERATING SYSTEMS

• Android
• Symbian
• iOS
• Blackberry

BOOTING - Means start of an operating system when the computer is switched on.

• Cold Booting - Starting after complete shut down.
• Warm Booting - By pressing RESTART button.

USER INTERFACE - interaction plane between the user and the computer.

• GRAPHICAL USER INTERFACE - use of symbols, metaphors and pointing devices to communicate.
• CHARACTER USER INTERFACE - by typing commands.