Why does windows not let me to uninstall some apps?

I'm running Windows 10. I've found that uninstall button is grayed out for some apps at Start > Settings > System > Apps & features. Which means I can't uninstall such apps. For example here is a screen-shot for Movies & TV app which I want to uninstall:

So, why is Windows not letting me uninstalling some apps? Are those apps essential to have or without which Windows may not work?

And how do I uninstall those apps that I feel no need and want to uninstall? I've also tried Control panel but it doesn't list those apps at Control Panel > Programs & Features > Uninstall a program.

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