Definitions of terrorism, quasi-terrorism, and some common characteristics of terrorism are presented. These include the use of violence as the principal method of systematic coercion, the selection of targets and victims who are likely to attract maximum publicity, and the initiation of unprovoked attacks. A terrorist is described as generally young, between 20 and 35 years of age, usually male, reasonably well-educated, of middle-class background, and marginally economically self-sufficient. The article further emphasizes that anyone can be a victim of terrorists. Characteristics of transnational and international terrorism are described briefly and the vulnerability of democracies to terrorism is analyzed as based on their adherence to democratic principles, freedom of speech and the media, and a growing technological dependence. The article recommends that vigilance, preparedness, and a response commensurate with the threat or act should govern tactical and strategic plans. Police should not be transformed into paramilitary organizations yet should call on defense forces, if necessary. In addition, a community consensus on the need to combat terrorism should exist and nations should coordinate timely exchanges of intelligence information. Finally, the importance of not overreacting to terrorism is viewed in the context of Australia's own experience and the experiences of others.