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The term "Hardware" refers to the physical elements of a computer; the machinery or the electronics in a computer. A basic computer consists of 4 components:
  1. Input device (or input unit)
  2. CPU (Central Processing Unit)
  3. Memory (or Memory unit)
  4. Output device (Output unit)

Input unit and Output unit (I/O)
Input unit sends (data) to the computer and output unit presents (information). Input unit: keyboard, mouse, flash drive, etc. Output unit: monitor, printer, speaker, etc.

Input and output unit or Input and output device (I/O) provide a way to interact with a computer. Some examples of I/O devices are: keyboard used to input text, mouse, touch pad, camera, monitor, speakers, touchscreen for simultaneous input and output.
Examples of hardware (I/O) in a computer are: Most of a computer's hardware cannot be seen as it is inside the computer case. Example: Memory, CPU, etc.
Memory Unit
The memory unit is what allows a computer to remember data and information. Similar to human memory, there is short term memory (RAM) and long term memory (Hard Disk Drive (HDD), Solid-State Drive (SSD) or Compact Disk Drive (CDD)).
Examples of hardware (Memory) in a computer are: When a computer is turned off, it forgets everything in the RAM (short term memory), while it saves everything it will need later into a disk drive (long term memory). When data is needed by the CPU, it's sent from the hard disk drive (HDD) or compact disk drive (CDD) to the RAM. RAM tends to be faster to process, whereas HDD/CDD have more data and require longer to process. CDDs let you change certain parts of the memory, essentially like a book or notebook that you might read and get information from.
A storage medium gives your computer a place to store data and information that it might need in order to operate. Some things that could be stored in memory might be: text documents, photos, programs, and the operating system (OS).

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