Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. official link: https://support.microsoft.com/en-us/windows/activate-windows-c39005d4-95ee-b91e-b399-2820fda32227

Checking your Windows activation status

You’ll first want to find out if your Windows 11 is activated and linked to your Microsoft account. It is essential that you link your Microsoft account to the Windows 11 license on your device. Linking your Microsoft account with your digital license enables you to reactivate Windows using the Activation troubleshooter whenever you make a significant hardware change.

Methods of Windows activation

Depending on how you got your copy of Windows 11, you’ll need either a digital license or a 25-character product key to activate it. Without one of these, you won’t be able to activate your device. A digital license (called a digital entitlement in Windows 11) is a method of activation in Windows 11 that doesn’t require you to enter a product key. A product key is a 25-character code used to activate Windows. What you’ll see is PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX.