This unit of computer allows to feed data , instructions, objects. Images, Hand written, text, signatures etc The deice which are used to fed the data or instructions are called input devices like as keyboard, mouse ,scanner, mic , camera etc.
Keyboard - This is standard input deice which supports to feed the data and the instruction in a computer. This deice is directly connected to C P U through wire normally it has 101 to 110 keys includes, characters, numeric keypad etc each key hauling its own code which is known as ASCII (code American standard code for information interchange).
Now - a - Days cordless key board is available in market that can be used within 20m. It is helpful to show the contently on projector directly.