Mouse is a input device and also a pointing device that allows a user to control a pointer on the screen.A pointing device can be used to move the insertion point, select text, graphics, and other objects; click buttons, icons, links, and menu command.It is a pointing device that fits under the palm of your hand comfortably.The shape of mouse is top and sides of the mouse has one to four buttons;some also have a small wheel.The bottom of a mouse is flat and contains a mechanism that detects movement of the mouse.  There are several type of mouse:

Laser mouse

Optical mouse

Air mouse

Optical Mouse

  Optical mouse has no moving mechanical parts inside;it uses devices that emit and sense light to detect the mouse's movement.

Laser Mouse

  Uses a laser and more expensive than optical mouse. It can place on nearly all types of flat surface.

Air Mouse

  It is a newer type of mouse,is a motion-sensing mouse, with the typical buttons allow you control objects, media players, and slide shows by moving the mouse in predetermined directions through the air.