How to describe things like this?
Poland and America both have mutual free Visa pass, that means people in these two countries won't need a Visa to go to another one? (Should I use bilateral sounds better in this sentence?) Is there any other way to say this?

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I believe diplomats refer to that as “reciprocity” — the two countries have reciprocal visa waiver policies. As far as I know, there is no bilateral agreement, it’s just that one country includes the other’s citizens in a visa-waiver program, and the other country returns the favor (“reciprocates”).

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Poland and the United States have mutual visa-free entry, which means people in those countries won't need a visa to visit each other