System case

Computer system cases can be different sizes. There can be small, medium and large system cases.

There could be also all-in-one computer unit.

Regular computers can be upgraded, or enhanced with additional functionality. However all-in-one computer has limited upgrade ability. You can replace memory, or install a bigger long-term storage disk there, but this is about all of the enhancements you can do with such a system.

Adding hardware to a regular system unit is much easier than adding hardware to all-in-one system unit.

Number of devices will depend on availability of expansion slots and power support by the power supply unit.

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