Safe Haven Currencies

Can anybody explain to a complete novice like myself, why safe haven currencies are, well… safe haven currencies?

In particular the Yen, I have read a couple of articles but need it spelling out i’m afraid.

Regards

Z

Is it because Japan, and its creditors obviously, will never run out of yens? As they are printing whatever quantity they like/need together with being a strong economy, i think 3rd place worldwide?
Don’t know…

Good question!

Thank you very much etfak, this helps.

Z