Keyboard is one of the main input devices of computer. Almost all the data for processing is input through the keyboard. And most of the instruction work is done with the help of keyboard. Again, all the work of writing the program is done with the help of keyboard. Types of keyboards: The keyboard can be divided into two parts according to the process of receiving data input. Namely - 1. Serial keyboard and 2. Parallel keyboard. The keyboard is divided into two parts depending on the manufacturer . Namely - 1. Apple keyboard and 2. IBM keyboard. Again , IBM's ready-made keyboard can be divided into three parts. Namely - 1. Keyboard with 63 buttons , 2. Keyboard with 64 buttons , 3. Extended keyboard. But now 104 keyboard keyboard is being used more.