to generate fear in the community, or substantial segment of it, for political purposes. Non-Political terrorism – Terrorism that is not aimed at political purposes but which exhibits "conscious design to create and maintain a high degree of fear for coercive purposes, but the end is individual or collective gain rather than the achievement of a political objective". Anonymous terrorism – In the two decades prior to 2016–19, "fewer than half" of all terrorist attacks were either "claimed by their perpetrators or convincingly attributed by governments to specific terrorist groups". A number of theories have been advanced as to why this has happened. Quasi-terrorism – The activities incidental to the commission of crimes of violence that are similar in form and method to genuine terrorism but which nevertheless lack its essential ingredient. It is not the main purpose of the quasi-terrorists to induce terror in the immediate victim as in the case of genuine terrorism, but the quasi-terrorist uses the modalities and techniques of the genuine terrorist and produces similar consequences and reaction. For example, the fleeing felon who takes hostages is a quasi-terrorist, whose methods are similar to those of the genuine terrorist but whose purposes are quite different. Limited political terrorism – Genuine political terrorism is characterized by a revolutionary approach; limited political terrorism refers to "acts of terrorism which are committed for ideological or political motives but which are not part of a concerted campaign to capture control of the state". Official or state terrorism – "referring to nations whose rule is based upon fear and oppression that reach similar to terrorism or such proportions". It may be referred to as Structural Terrorism defined broadly as terrorist acts carried out by governments in pursuit of political objectives, often as part of their foreign policy. Other sources have defined the typology of terrorism in different ways, for example, broadly classifying it into domestic terrorism and international terrorism, or using categories such as vigilante terrorism or insurgent terrorism. One way the typology of terrorism may be defined: Political terrorism Sub-state terrorism Social revolutionary terrorism Nationalist-separatist terrorism Religious extremist terrorism Religious fundamentalist Terrorism New religions terrorism Right-wing terrorism Left-wing terrorism Communist terrorism State-sponsored terrorism Regime or state terrorism Criminal terrorism Pathological terrorism Causes and motivations Choice of terrorism as a tactic Individuals and groups choose terrorism as a tactic because it can: Act as a form of asymmetric warfare in