How-To Geek

Modifier Key

A modifier key is a key that modifies the action or output of another key when pressed with that secondary (or even tertiary) key. The most commonly used modifier key is the Shift key, which when pressed with an alpha or numeric key, capitalizes the letter or activates the secondary symbol, respectively.

Other familiar modifier keys include CTRL (used frequently in keyboard shortcuts for cut and paste on Windows machines, CTRL+C and CTRL+V, for example), ALT (often used to access GUI menus), and operating system dependent special keys such as the Windows Key on Windows computers and the Command Key on Apple computers.

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