Modifier Key
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A modifier key modifies the action of another key when the keys are pressed at the same time. Common modifier keys include Shift, Function, Control, Alt, Command, and Option. The Shift key is found on all keyboards, while the other keys may be exclusive to laptops or Windows or Macintosh computers. Below is a list of the common modifier keys and their primary uses.
Modifier Key meaning & definition 1 of Modifier Key.