Mouse

Otherwise known as a computer mouse, is a peripheral that allows users to interface with their computer via two-dimensional pointing motion which produces a corresponding graphical change to the interface. On most systems, this translates to a pointer on screen moving alongside the mouse's motion. It can also trigger further interface options such as opening and navigating menus with use of its button input.

In it's most recognizable form, it is comprised of two buttons corresponding to a left and right, a scroll wheel which can also be pushed down to act as a third button. Originally it had a ball in roller and detects motion with it's movement on the surface. Nowadays mice feature optical sensors with no moving parts. The device has appeared with both wired and recently, wireless capabilities.