What about the Islamic banks? They do not take rate fees because that being "against the believes", but also, they do not pay interest rates. I've read someth

What about the Islamic banks? They do not take rate fees because that being "against the believes", but also, they do not pay interest rates. I've read something about that a while ago and thought "ok, but how do they earn money". It was not clear for me, how they do that. And, yeah, it wasn't of any importance for me.