This is the 1700th most frequent Korean word.
외교
Diplomacy.
The word 외교 here refers to 'diplomatic' as related to international relations between countries.
그 나라는 다른 나라와의 외교 관계를 강화하고 있습니다.
That country is strengthening its diplomatic relations with other countries.
In this usage, 외교 signifies the general concept and practice of diplomacy in international affairs.
외교는 국가 간의 평화를 유지하는 중요한 역할을 합니다.
Diplomacy plays an important role in maintaining peace between nations.
Here, 외교적인 is an adjective meaning 'diplomatic,' emphasizing an approach or method characterized by diplomacy.