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1. The Central Processing Unit (CPU)

   • The CPU is the primary component of a computer that processes instructions. It runs the operating system and applications, constantly receiving input from the user or active software programs. It processes the data and produces output, which may stored by an application or displayed on the screen.

2. Binary logic

3. Memory

   • Image result for memory computing In computing, memory refers to the computer hardware devices used to store information for immediate use in a computer; it is synonymous with the term "primary storage".
   • registers cache RAM virtual memory

4. Input and output devices

   • Examples of manual input devices are: Keyboard Mouse Touchpad Joystick Touchscreen Concept keyboard Scanner Graphics tablet Microphone Digital camera
   • An input device is a piece of hardware that is used to enter data into a computer or a similar processing device such as a smart phone.
     • Here are some examples of output devices: Monitor Printer Plotter Projector Speaker Headphones Light / LED
   • An output device is a piece of hardware that is used to output data that has been previously entered into a computer or similar processing device.

5. Secondary storage

   • secondary storage, secondary memory or external memory, is a non-volatile memory (does not lose stored data when the device is powered down) that is not directly accessible by the CPU, because it is not accessed via the input/output channels
   • Flash Memory
   • Optical Disk
   • Magnetic Disk
   • Magnetic Disk

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