The keyboard shortcut "Command + Shift + Z" is commonly used in various software applications, particularly in macOS environments. It typically functions as the redo command, allowing users to reverse the last action that was undone. This is especially useful in programs like Microsoft Word or Adobe Photoshop, where users may want to restore changes after mistakenly undoing them. When you press "Command + Shift + Z," it re-applies the most recent change that was removed. This shortcut enhances productivity by providing a quick way to manage edits and adjustments without navigating through menus, making it a valuable tool for users working on creative or document-based tasks.