The term “international cooperation” can be interpreted in various ways, but broadly speaking, it likely refers to collaboration among countries in addressing global challenges and adapting to the evolving dynamics of the world. “International Cooperation in the New Reality” extends to all areas from trade and finance to security, environment and education and health issues. International cooperation stands for a relation not only at country-level, but it also unifies professionals from various states. Modern types of international cooperation do not only include mutual support between governments and institutions from different countries—nowadays, international cooperation refers to a wider range of notions. It means working together as one government and institution, not making individual decisions and actions. International cooperation aims to develop common standards and to create programmes that take into account benefits/problems that can potentially be extended to more than one society and even to all communities worldwide. For ensuring Good Governance in general sense, it is important to make use of all the forms of international relations. Accordingly, this chapter discusses the importance of its various manifestations, trends and challenges that countries are facing worldwide.