Keyboard is an input device which is used to input different commands, instructions and values. It is used for executing, entering and for selection purpose. It consist number of keys for different functions. A standard keyboard has 102 key while multimedia keyboard has more number of keys. It has numeric function keys, printing keys and non-printing keys. All keyboard have common working principle. But the architecture can be different. It consist of 3 plastic layers which have two (first and last)circuits while other has holes on it. When any key is pressed the spring or rubber membrane stroke on the dot of circuit.hence, current signs flow through the circuit. All signal passes to the IC if keyboard and is further sent to the CPU
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