What will happen if your windows do not activate ?

having limited access to some basic feature:

1. customize your display

2. crucial security updates, bug fixes, or patches

3. can't lock screen

4. you’ll be limited to the default wallpapers that come with Windows.

5. You can’t remove the default theme

6. You’ll have default fonts only

7. Your Start Menu settings can’t be configured

8. You can’t customize your taskbar

9. Activate Windows watermark

10. You’ll get persistent notifications to activate Windows 10