The keyboard shortcut Ctrl + Y is commonly used in various software applications to perform the "Redo" action. This function allows users to reverse the last "Undo" command, restoring a previously removed action or change. It is particularly helpful in editing documents, graphics, or code, enabling a smoother workflow. When you accidentally undo an action, pressing Ctrl + Y can quickly reinstate it without having to redo the work manually. This feature is widely available in programs like Microsoft Word, Adobe Photoshop, and many others, making it a valuable tool for enhancing productivity and efficiency.