The English School of International Relations emerged in the 1950s as a response to realism and idealism. It focuses on the concept of international society, emphasizing shared norms, rules, and institutions that govern relations between states. Key thinkers like Hedley Bull and Martin Wight developed the theory, which sits between realism and liberalism. It recognizes power politics but also highlights the role of diplomacy, international law, and organizations in shaping state behavior and facilitating cooperation.