Microsoft uses flexible license politics and distributes its products through different channels: retail, OEM, volume license, academic, etc. Windows 10 can be activated with a product key or with a digital license (or digital entitlement). A Windows product key consists of 25 alphanumeric characters. The code helps verify that the software is not used on more PCs than allowed in the Microsoft Software License Terms. What Is a Windows Product Key?Ī Windows product key is a code that you need to activate your Windows OS. In this post, we will tell you what a Windows product key is, where to find it, and how to check whether it is genuine or not. Whether you decide to install Windows 10 or to move your system to another computer, you will need to know your Windows product key.