A product key is a 25-character code that's used to activate Windows and helps verify that Windows hasn't been used on more PCs than the Microsoft Software License Terms allow.
- Windows 10: In most cases, Windows 10 activates automatically using a digital license and doesn’t require you to enter a product key. Microsoft doesn't keep a record of purchased product keys—visit the Microsoft Support site to learn more about activating Windows 10.
- Windows 7 and Windows 8.1: Product keys can typically be found in the confirmation email you received after purchasing Windows or in the box Windows came in.
Article ID: 4028160 - Last Review: 2017, ഓഗ 30 - Revision: 5
Windows 10, Windows 8.1, Windows 7