The windows shortcut key for closing an active application is

The windows shortcut key for closing an active application is Alt+F4. When you press the Alt+F4 keys on your keyboard, it sends a signal to the currently active application that you want to close it. This can be useful when you want to quickly exit a program that you are no longer using. The Alt+F4 shortcut is designed to work with most applications in Windows, including web browsers, text editors, and media players. When you press Alt+F4, the program will usually ask if you want to save any changes you've made before closing. It's important to note that Alt+F4 will only close the active application, which means that if you have multiple programs open, you'll need to switch to each one and press Alt+F4 individually to close them. In summary, Alt+F4 is a simple and convenient shortcut key that can help you quickly close applications in Windows.