Ok i am confused because i think this is not something acknowledged worldwide .

Two things we are talking about

the metal bars installed within the stones, those are meant to protect the kids from falling specially if you live on non ground floor, some ground floor install them to prevent burglaries, but it’s mainly to protect kids from falling

Example

Now you were asking about windows shutters (i dont know the market name for them worldwide) Anyway those are meant to give privacy at night, shield from cold winter, block the light coming from windows when you sleep, and sometimes noise blocking at daylight.

Example brown thing behind the metal bars

Both should coexist in most apartments, its a normal thing here.

That's exactly what they look like to me. External blinds like this are quite common in my neck of the woods.