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The Control (Ctrl) key is a modifier key found on most computer keyboards. It is typically located on the bottom row of keys, to the left of the spacebar. The Ctrl key is used in conjunction with other keys to perform various functions, such as copying, pasting, and undoing actions. It is also used to access shortcuts in many software applications. The Ctrl key is often abbreviated as "Ctrl" or "Ctl" in keyboard shortcut instructions. In some contexts, it may be referred to as the "Control" key, especially in documentation or user manuals. The Ctrl key is an essential tool for power users and is widely used in both Windows and macOS operating systems, although the specific functions it performs may vary slightly between the two platforms.