Mice: Point-and-Click Input Devices

It's a funny name, but a necessary device.

A computer mouse is a small handheld device. Most mice consist of an oblong case with a roller underneath and two or three buttons on top or along the sides. When you move the mouse along a desktop, an onscreen pointer (called a cursor) moves in response. When you click (press and release) a mouse button, this motion initiates an action in your program.