Microsoft uses Windows Activation to prevent software privacy by ensuring that you are using a genuine Windows copy. Windows Activation makes sure that a particular copy is not running on multiple systems.
What is the use of activating Windows?
Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow.
Is it important to activate Windows?
Not activating windows will not cripple your ability to use the software. In fact, the only difference between an activated and unactivated Windows operating system is the ability to customize the look and feel of your user interface.
Is it important to activate Windows 10?
If you don’t activate Windows 10, some features will be disabled upon the expiry of the trial period. For instance, you won’t be able to customize your PC or laptop, meaning features like themes, lock screen, colors, fonts, and taskbar will return to their default settings (if you customized them).