computer hardware is a collection of an element that constitute a computer system,computer hardware elements are cpu monitor,mouse,keyboard,data storage,hdd disk,graphic cards,lane cards,video cards, modem,memory,motherboard,chips,dvd writer,floppy disk etc. these are all elements can b touched. input devices: 1.mouse 2.keyboard 3.scanner 4.printer 4.web cam 5.mic 6.light pen cpu: called the brain of computer. ram: caleed as a random access memory. rom: read only memory.