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Computer hardware includes the physical, tangible parts or components of a computer, such as the cabinet, central processing unit, monitor, keyboard, computer data storage, graphics card, sound card, speakers and motherboard.[1] By contrast, software is instructions that can be stored and run by hardware. Hardware is so-termed because it is hard or rigid with respect to changes or modifications; whereas software is soft because it is easy to update or change. Intermediate between software and hardware is firmware, which is software that is strongly coupled to the particular hardware of a computer system and thus the most difficult to change but also among the most stable with respect to consistency of interface. The progression from levels of hardness to softness in computer systems parallels a progression of layers of abstraction in computing.

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