Microsoft offers Windows 11 for free to eligible devices. If you're running a genuine version of Windows 10, you can upgrade to Windows 11 for free. However, if you're looking for a completely free version of Windows 11 without a product key, it's not officially possible.
Technically, no. You can install Windows 11 without a product key, but there are some limitations. If you don't enter a product key during installation, you'll see a watermark on your desktop reminding you that Windows isn't activated. Additionally, some features and customization options might be restricted.
A Microsoft product key is a 25-character code used to activate a Microsoft product, including Windows operating systems. It's usually required to complete the installation process and to verify that the software is genuine.