The product key is a 25-digit alpha-numeric code that you must physically put into your OS to activate it. This can be done using any one of the following methods: Digital Licenseīefore we dig into the various types of product keys, we would like to bring to your attention the 2 different methods a Windows operating system is activated.
Check if your Windows License can be Transferred.How to Check if Windows is Retail, OEM, or Volume Licensed.Original Equipment Manufacturer (OEM) Licenses.