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Computer hardware is the physical parts or components of a computer, such as the monitor, mouse, keyboard, computer data storage, hard disk drive (HDD), graphic cards, sound cards, memory, mother board, and so on. Examples of computer hardware are

Input devices – mouse, scanner, light pen, joystick, etc.
Output devices – printer, monitor, plotter, speaker
Storage devices – primary memory and secondary – RAM, ROM, hard disk, CD/DVD ROM, flash drive, memory card, magnetic disk, etc.
Processing devices – Arithmetic and Logic Unit (ALU) and Control Unit (CU)
Other devices – computer case, cooling fan, heat sink, cables and connectors, etc