Welcome to Computer Gyan, In this chapter you will learn about input and output devices briefly. Input device:- An input device is any hardware device that sends data to a computer. These devices are used to input(or enter) data and instructions into the computer system. Keyboard-it is the most commonly used input device. Which uses an arrangement of buttons and keys to. Both data and program, can be entered into the computer through the keyboard. keyboard Types of keys on board:- Alphanumeric k