White Polystyrene

Why do you find polystyrene in boxes with electronics?
So you buy a tv,or a vacuum cleaner,you get home you open the box and you will always find white polystyrene.But why?Polystyrene is a construction material for use of warming your home if applied polystyrene in your home walls,so what is that has to do with the tv or the vacuum?Thank you!
The foam protects the contents of the box. If the box is dropped, the foam will absorb the impact and keep the electronics safe.
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