A shortcut key is a combination of keys on a keyboard that performs a specific function quickly, allowing users to execute commands without navigating through menus. For example, pressing Ctrl + C copies selected text, while Ctrl + V pastes it. These shortcuts enhance productivity by saving time and effort. Shortcut keys are commonly used in various software applications, including Microsoft Word, Excel, and Adobe Photoshop. They can vary between programs, so users often refer to the software's documentation to learn the available shortcuts. Mastering these keys can significantly improve efficiency in daily tasks.