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A Windows 10 key allows you to activate your copy of Windows 10 and make use of it. The key is used to prove your identity when trying to upgrade and download updates or files, or open attachments you have received by email. If you lose the original key to your product and you want to get another Windows 10 product key by using the activation code found on the back of the packaging. In case where you choose a knockout post about windows keys, click over here.