Mouse

The mouse is the device that lets you point  the cursor to any part of the  screen in a graphical operating system like Windows. The main parts in most mice are two little rollers - one on the X-axis and the other on the Y-axis. At the base of the mouse there is a ball that comes into contact with these two rollers. When you move the mouse over a surface, the movement of the two rollers is converted into digital information that decides the direction and rate of movement of the cursor.

Now, we have optical mice which have an optical sensor built into the base, that 'sees' the movement of the surface underneath the mouse. This allows greater accuracy and precision in moving the cursor. Mice are identified according to their interface and the technology that they use.