Mouse

A mouse is a pointing. As well as positioning device. It contain two or three buttons. As the rolls it on a flat surface, the mouse controls cursor movment on the screen. When the user presses one of the buttons , the mouse either markes a place on the screen or makes selections from data on the screen. It can be used for many applications, ranging from games to designing products with graphics.
It can be used as an alternative to keyboard or it can be used in combination with a keyboard to enhance input operations.