Regardless of time and space, conflict is a phenomenon that can be observed in all social processes. This course concentrates on the coercive and incompatible interactions of human communities that take place between two or more parties that impose their will on one another. The course consisted of five major chapters. The first of them investigate whether the states of conflict and peace are embedded in human nature or whether they are certain features that people acquire depending on their environment. The second chapter explores the causes of war at three levels of analysis (individual, state, and international) to find out what level to focus on to illuminate a particular conflict. The third chapter studies conflict and peace concepts through three mainstream IR theories to widen horizons in comprehending the state of conflict and peace. The fourth chapter, on the other hand, sheds light on the conditions necessary for the prevention of international disputes and the peaceful settlement of existing disputes. The last chapter outlines international conflict in the age of globalization to grasp the true characteristics of contemporary conflicts in the international realm.