This introduction presents an overview of key concepts discussed in the subsequent chapters of this book. The book discusses that to actions of support by regional and international organizations, such as the North Atlantic Treaty Organization (NATO), the European Union (EU) and the United Nations (UN) General Assembly and UN Security Council. The mobilization of the "civilized world" also resulted in some introspection by leaders of some of these countries, asking what might be done to prevent America's 9/11 to be replayed someplace else on the globe. The book addresses in each of countries has unfortunately experienced horrific terrorist events on their home soil within immediate past of the countries. Japan's major terrorist attack, the Sarin gas attack on the Tokyo underground mass transit system in 1995, was the "oldest" of the attacks. It covers have been combating the plague of terrorism for years, and countries such as the UK and Israel.