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. Your product key should be in the confirmation email you received after purchasing Windows or in the box Windows came in. If you bought a PC with Windows preinstalled, contact the PC manufacturer for the original key.
In most cases, Windows 10 activates automatically using a digital license and doesn’t require you to enter a product key.
Article ID: 4028160 - Last Review: 2017, ജൂലൈ 29 - Revision: 1