The modern term “terrorism” dates back to 1795 when it was used to describe the actions of the Jacobin Club in their rule of post-Revolutionary France, the so-called “Reign of Terror”. A 1988 study by US Army found that more than one hundred definitions of the word exist and have been used. Most definitions of terrorism include only those acts which are intended to create fear, are prepared for an ideological goal, and deliberately target or disregard the safety of non-combatants. Terrorism in modern sense is violence or other harmful acts committed against civilians for political or other ideological goals.
Terrorism is used when attempting to force political change by convincing a government or population to agree to demands to avoid future harm, destabilizing an existing government, motivating a disgruntled population to join an uprising, escalating a conflict in the hopes of disrupting the status quo, expressing a grievance, or drawing attention to a cause. And it’s also often recognizable by a following statement from the perpetrators: violence, psychological impact and fear, perpetrated for a political goal, deliberate targeting of non-combatants, disguise, unlawfulness or illegitimacy.
Terrorism has been used by a broad array of political organizations: both right-wing and left-wing parties, nationalistic and religious groups, revolutionaries and ruling governments. A state can sponsor terrorism by funding a terrorist organization, harboring terrorism, and also using state resources, such as military, to directly perform acts of terrorism. There is a great variety of terrorist groups all over the world, all of them can be divided into several types: religious (Christian, Islamist, Jewish, Sikh), nationalistic (Irish nationalists, Ulster loyalists, Indonesia, Israeli, and Tamili), anarchist, leftist/communist/leninist/trotskyst/maoist/Marxist, ethnic terrorist (including neo-Nazis and white-supremacists),