Mouse

=__Mouse__ = In computing, a mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons. The name //mouse,// originated in the Stanford Research Institute, compared to the old computer mouse (which had a cord attached to the rear part of the device, suggesting the idea of a tail) to the common animal mouse. A mouse now comes with most computers and many other varieties can be bought separately.

__ Mechanical mouse device __
Bill English, builder of Engelbart's original mouse, invented the ball mouse in 1972 while working for Xerox PARC. The ball-mouse replaced the external wheels with a single ball that could rotate in any direction. It came as part of the hardware package of the Xerox Alto computer. The Xerox PARC group also settled on the modern technique of using both hands to type on a full-size keyboard and grabbing the mouse when required. The ball mouse has two rollers rolling against two sides of the ball. One roller detects the forward–backward motion of the mouse and other the left–right motion. These motion causes it to get electrical signals which then the mouse sends these signals to the computer system (When connected to the system by wire). And then, these signals allow it to be seen and move around on the screen.

** __Optical Mouse__ **
An optical mouse uses a light-emitting diode and photodiodes to detect movement relative to the underlying surface, rather than moving some of its parts – as in a mechanical mouse

__Wireless Mouse__
This mouse is an extremely popular technology to interact with your computer. While most of the mouse is connected directly to the computers peripheral input by a cord and are powered by the computers main power, wireless mice are becoming extremely popular to give computer users cordless accessibility to their mice and to interact with their computer.