This chapter contains sections titled: What Is Terrorism? Terrorism Statistics Purpose of Terrorism Goals of Terrorism Case Study: Economic Effects of a Terrorist Attack Objectives of Terrorism The Terrorism Challenge What is Homeland Security? The Motivation for Terrorism Common Terms in Terrorism Types of Terrorists Historical Terrorist Attacks International Terrorism Examples of International Terrorist Groups Terrorist Groups that Claimed Responsibility for Terrorist Attacks in 2004 Recent International Terrorist Attacks Domestic Terrorism Examples of Domestic Terrorist Groups Recent Domestic Terrorist Attacks References