A special key combination that causes a specific command to be executed. Typically, shortcut keys combine the Ctrl or Alt keys with some other keys. In Windows environments, for example, Ctrl +C is used as the shortcut key to copy. On PCs, the function keys are also often used as shortcut keys.
Most applications come with some shortcut keys already defined. Many, however, allow you to define your own shortcut keys for frequently-used commands.