A defined area of the screen, usually designed to look like a pushbutton, which, when clicked with a mouse, performs a given action often represented by an icon on the button face.
Data fed into a computer for processing. Computers receive input through an input device, like a keyboard, or from a storage device, such as a disk drive.
A keyboard is the primary computer input device used to input alphanumeric data.
A pointing device is an input device that allows users to manipulate a cursor in a graphical user interface. The most common example is a mouse, but other types include trackballs, graphics tablets, joysticks, and various pen-type devices.
