Why is there this black sheet on X200M notebook motherboard?

[gangalr]

Hi,
On my Asus X200M notebook, there's this black colored sheet covering the motherboard.
I am curious what is the purpose of placing such a sheet on top of motherboard?
Is is some sort of insulator. It's black and is not transparent.
See a photo.
Thanks & regards.
R Gangal.

[pndiode]

Yep!

An insulator to prevent electrical shorts/arcing/fire retardant when dropped, stomped on, or ran over by anything. Maybe, causes for delayed traveling or trips to other places.

https://www.youtube.com/watch?v=FnAa31cslks