By its definition, terrorism is meant to inflict great fear into people through acts of mass destruction. September 11, 2001, is a day of infamy to Americans because of the terrorist attacks on the United States. But every year more than 300 terrorist acts take place around the globe. Counterterrorism has become a lasting issue of prime importance to the security of all nations. This book familiarizes readers with several counterterrorism technologies on constant guard, including satellites to track movement, biodetectors to expose chemical warfare, and biometrics to identify suspects. It also introduces readers to different organizations associated with terrorist activities, their motivations, and the challenges involved in protecting people from terrorist attacks.