Once you have your 32-character serial key, you can activate it through the Nero ControlCenter Nero ControlCenter from your Start menu. Click on the Serial Numbers tab on the left. and enter your key into the text field.
A serial key, also known as a product key or activation key, is a unique code used to activate and validate a software product. In the case of Nero 12 Essentials, the serial key is required to unlock the full features of the software and ensure that it is being used legitimately.