Friendly relations or cooperation between countries, organizations, or groups.
両国は長年にわたって友好関係を保っている。
The two countries have maintained friendly relations for many years.
地域間の友好交流で学生たちが行き来した。
Students traveled back and forth in a friendly exchange between regions.
友好の証として、両市は姉妹都市を結んだ。
As a sign of friendship, the two cities became sister cities.