Diplomatic relations between countries are an important aspect of international relations, which aims to maintain security, trade and cooperation between countries. The history of diplomatic relations can be traced back to ancient times, where representatives between countries such as Egypt, Mesopotamia and Greece had negotiated to reach a peace agreement. In the Middle Ages, diplomatic relations became increasingly structured with the emergence of the modern diplomatic system. One key figure was Niccolò Machiavelli, who wrote about the art of politics and diplomacy in his work, “The Prince.” In this period, European countries developed permanent representation systems that allowed diplomats to reside in foreign countries as liaisons between governments. Entering the 20th century, after World War I, diplomacy changed with the emergence of international organizations such as the League of Nations. This marks a shift from bilateral to multilateral diplomacy, where countries meet to solve global problems collectively. This diplomacy focuses on issues such as international security, human rights, and climate change. The Cold War era saw diplomacy colored by ideology, where the Western bloc led by the United States competed with the Eastern bloc led by the Soviet Union. Diplomacy during this period often centered on arms negotiations and international crises, such as the Cuban Missile Crisis. Through international agreements, the two blocs are trying to reduce tensions and improve communications. With the end of the Cold War, diplomatic relations entered a new phase. Globalization is the main driver, where countries not only focus on bilateral relations but also on social and economic relations. For example, strengthening free trade agreements and cooperation in the fields of information technology and the environment is becoming increasingly important. In the contemporary era, diplomacy also faces new challenges such as cyber diplomacy and public diplomacy, where countries must adapt to technological developments and changes in public perception. Digital diplomacy has emerged as an important tool in building relations between countries, enabling more efficient and faster communication. The importance of diplomatic relations is also reflected in the role of international organizations such as the United Nations (UN) which mediates and maintains world peace. Through these forums, countries can discuss global issues constructively. Modern diplomatic relations require countries to develop strategies that are not only based on national interests but also global interests. Thus, it is important for countries to continue to adapt to new dynamics in international politics and seek mutually beneficial solutions. Successful diplomacy depends not only on formal negotiations but also on informal relationships and cultural understanding between countries. Cultural exchange programs and educational cooperation are important aspects in building better relations. By increasing mutual understanding, countries can prevent conflict and strengthen cooperation in various fields. As time goes by, diplomatic relations also require innovation in negotiation and communication strategies. Countries must be able to utilize social media and digital platforms to engage with foreign citizens and promote their values ​​and policies. In this way, diplomatic relations are not only limited to political elites but also involve the wider community. The history and development of diplomatic relations shows how important this aspect is in maintaining world peace and stability. Countries must continue to learn from past experiences to build better cooperation in the future. Effective diplomacy will always be a vital tool in achieving common goals and creating a more harmonious world.