This is the 773rd most frequent Japanese word.
交換
Exchange; swap.
Here, '交換' is used to describe a reciprocal action of giving and receiving items between two parties.
友達とプレゼントを交換しました。
I exchanged gifts with a friend.
In this case, '交換' refers to the action of substituting one item with another of the same kind.
バッテリーが古くなったので交換しました。
I replaced the battery because it became old.
Here, '交換' signifies an exchange involving people, aiming to foster mutual understanding.