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Social science research on terrorism has grown rapidly in recent years, aided by social and legal studies. In this review, we examine research on the causes of terrorism and the effectiveness of strategies for countering it. We define terrorism as the threatened or actual use of illegal force directed against civilian targets by nonstate actors in order to attain a political goal through fear, coercion, or intimidation. Our review of causes is divided by level of analysis into sections on individual-, group-, and macro-level explanations. Our evaluation of counterterrorism strategies includes reviews of legal, criminal justice, military, and legitimacy campaigns. Psychopathological approaches have been largely discredited; however, evidence suggests that certain experiences, attitudes, and behaviors are overrepresented among terrorists. The potential impact of ideology, leadership, popular support, Diasporic communities, and …