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Operating System(OS), Desktop Operating System, Server Operating System,…

- - - - Example: iOS and Windows (Mobile Edition)
- - - - The process of starting or restarting a computer or mobile device is called booting
        There 2 types of booting
        
        Cold boot is the process of starting a computer that has been powered off completely
        
        2.warm boot is the process of restarting a computer while it remains powered on
      - There 3 ways of shutting down computer and mobile devices
        
        Shutting down/Log off
        
        2.sleep mode save any open documents and programs to RAM, turn off all functions and then place the computer in a low-power state
        
        hibernate safe any open documents and program to a hard disk before removing power from the computer