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The Computer Case is the metal skeleton housing its various internal components. Standards exist to ensure a level of protection in line with current regulations. The cases have also other uses such as sound insulation or protection against electromagnetic radiation and dust and water.
The main choice elements of a case are its form factor, its dimensions, the number of places for readers, its power supply, the connection on the front and finally its design and its colors. today there are cases of all shapes, sometimes even transparencies.