An activation license to Windows 11 Pro to Windows 10 Pro includes a product key, which can be used to verify the authenticity of one's operating system. It key is typically entered throughout installation or supplied through a digital license if you upgrade from a previous version of Windows.Without a valid activation license, you risk your chance of encountering protection risks like as spyware infections or even system crashes. Additionally, an illegal or invalid Windows installation may always stop you from receiving essential software updates that fix pests and improve functionality.