Input devices

Input devices are used for entering data or instructions to the central processing unit(CPU). The data obtained is converted from human readable form to machine language (0s and 1s) commonly referred to as binary digits(bits). The process of converting data to binary digits is called digitizing. Data and instructions from input devices must be digitized in order for them to be understood by the computer.

Input devices can be classified according to how they are used to enter data.
This includes:
1.Keying devices such as the keyboard,keypad etc.
2.Pointing devices such as mouse,trackball etc.
3.Scanning and other data capture devices.
4.Speech recognition or voice input devices.
5.Touchscreen,digitizer and digital cameras.