Focusing on the phenomenon of terrorism in the age of ISIS/ISIL, Terrorism and Counterterrorism investigates this form of political violence in an international and American context and in light of new and historical trends. In this comprehensive and highly readable text, renowned expert Brigitte Nacos clearly defines terrorism's diverse causes, actors, and strategies; outlines anti- and counter-terrorist responses; and highlights terrorism's relationship with the public and media. Terrorism and Counterterrorism introduces students to the field's main debates and helps them critically assess our understanding of, and our strategies for, addressing this complex and enduring issue. New to the 5th Edition Covers important terrorist developments since 2012 including the death of Osama bin Laden, the rise of ISIS, the proliferation of home-grown jihadism including the Boston Marathon bombing, and the revelations of Edward Snowden and the NSA. Refines the treatment of important issues including "justifiable" or "legitimate" terror, waves of terror, and state sponsored terror, among others. Amplifies the coverage of media and terrorism including e-terrorism, the role of social media in recruitment, "propaganda by deed," and other cutting edge topics.