Diplomacy is transforming and expanding its role as the method of interstate relations to a general instrument of communication among globalized societies. Adapting to globalization, the practice of diplomacy is shared by non-state participants, thus becoming privatized and popularized. This book offers a comprehensive understanding of the widening scope of public as well as private diplomacy and its normative framework. It features a practitioner's inside view of diplomacy combined with interdisciplinary academic analysis.