The keyboard shortcut "Ctrl+Y" is commonly used in various software applications to redo an action that was previously undone. This function is particularly helpful in text editing and graphic design programs, allowing users to quickly restore changes they have reverted. In many applications, "Ctrl+Y" works in conjunction with "Ctrl+Z," which is the shortcut for undoing actions. Together, these shortcuts enhance productivity by enabling users to easily navigate their editing history and manage changes efficiently. This feature is widely supported across platforms, including Windows and macOS.