I will discuss about the Cold War and Post cold war era and also Cold War 2.0. The rivalry between great powers in contemporary era. How the world order changes after the post second world war into bipolarity and after Soviet disintegration the world becomes unipolar. With the coming of golabalisation the world became multipolar. In this multipolar world how equations change between the states and also the role of non state actors makes the understanding of international politics much more interesting and relevant. Also what factors led to the emergence of New Cold War and what are its implications, is ideology still a basis of cold war politics or something else is heating the scenario , Was cold war really a cold war and many other questions we are going discuss in this lecture on Cold War . Understanding the world politics and changing scenario among the states relevant in this era of globalization