A piece of computer hardware (the keyboard and the mouse being the most popular examples) that is used to enter and manipulate information on a computer Other input devices include, but are not limited to, Light Pens, Touch Screens, Graphics Tablets, and trackballs
Defination: to enter information and instructions into a computer for storage or processing
The conduit through which data and instructions enter a computer For example, the keyboard, a mouse, a joystick