What does it mean when two countries agree to "free trade"?

Trade agreements are when two or more nations agree on the terms of trade between them, they determine the tariffs and duties that countries impose on imports and exports, that include anything shipped into the country even if it's by the foreign subsidiary of domestic film.

Definition : Trade agreements are when two or more nations agree on the terms of trade between them. They determine the tariffs and duties that countries impose on imports and exports ... That includes anything shipped into the country even if it by the foreign subsidiary of a domestic firm.