Dag Hammarskjöld is renowned for promoting the concept of peaceful coexistence in international relations during his tenure as the second Secretary-General of the United Nations. He advocated for diplomacy and conflict resolution, aiming to foster cooperation between nations. Hammarskjöld's efforts emphasized the importance of understanding and addressing global challenges collaboratively. His legacy includes a commitment to human rights and peace, inspiring future leaders to prioritize dialogue and mutual respect in international affairs.