1. There are many definitions of terrorism. Some of them are as follows: Brain Jenkins said that terrorism is the use or threat of force to bring about political change. While Walter Lacqueur said that terrorism constitutes the illegitimate use of force to achieve an apolitical objective by targeting innocent people. Another definition comes from Edward Herman, who said that terrorism should be defined in terms of state repression, such as the corrupt governments of Latin America. Another view of terrorism comes from Alex Schmidt, who states that there is no true or correct definition, because terrorism is an abstract concept with no real presence. A single definition cannot account for all the potential uses of the term. The final definition discussed here is the official definition of terrorism published by the Federal Bureau of Investigation. They say it is an unlawful use of force to intimidate a government to promote political or social goals. Although these are just some of the definitions of terrorism, they provide a good overview of the term terrorism.2. Martha Crenshaw said that terrorism means socially and politically unacceptable violence aimed at an innocent target with the aim of achieving psychological effect. She also cited three criteria to make it a terrorist attack. The first is that military methods must be used. Second, there must be a military target involved and, finally, there must be a chance of victory.3. J. Bowyer Bell said there are six types of terrorism and each side has a goal. The six are; psychotic who attempts to obtain psychological gratification. The second concerns the criminal attempts of witches to benefit the terrorist. Then there is the type of vigilante terrorism that attempts to seek retaliation for a given act. Fourth, there is endemic terrorism; the witch is a kind of internal struggle. The fifth type of terrorism is authorized terrorism, which concerns state repression of a group. Finally, we have revolutionary terrorism, which modifies behavior through fear.4. According to Bell, one of the many types of terrorism is revolutionary terrorism. Here are some of the forms of revolutionary terrorism. One form is organizational and aims to maintain discipline within a terrorist group. The second is allegiance, which attempts to gain public support for a given terrorist group. Third, there is functional revolutionary terrorism, which attempts to accomplish the missions of terrorist groups. Another form is the proactive type, which prompts governments to repress a group of people..