Modifier key

Key on the keyboard that is only used in conjunction with another key. For example, on an IBM compatible computer, the Alt, Ctrl, and Shift keys are modifier keys. On the Apple Macintosh computer, the Control, Option, and Shift keys are modifier keys. Modifier keys are often used in conjunction with other keys to perform computer keyboard shortcuts. For example, in many text editor programs pressing the Ctrl + A will select all text.

Related pages

Also see: Keyboard terms, Shortcut key