A computer doesn't require all the components mentioned above. However, a computer cannot function without having at the very minimum the parts listed below.
- Processor - Component that executes instructions from the software and hardware.
- Memory - Temporary primary storage for data traveling between the storage and CPU.
- Motherboard (with onboard video) - Component that connects all components.
- Storage device (e.g., hard drive) - Slower secondary storage that permanently stores data.
A computer with only these essential parts works but doesn't allow user interaction until at least one input device (e.g., keyboard) is connected. Also, you would need at least one output device (e.g., monitor) for you to see what is happening.
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