Terrorism is considered to be one of the main global problem today. Especially, after the September 11 terror attacks on the World Trade Centre and the Pentagon, the politicians and even public started trying to figure out the causes for such terrifying attack. In fact, the term terrorism has several definitions, yet in most general form, according to the Hoffman (2006) terrorism can be identified as ”the deliberate creation and exploitation of fear through violence or the threat of violence in the pursuit of political change”. Moreover, the notion of terrorism is usually perceived as a negative act (Medina & Hepner, p.10). ”Because of the negative nature of this term, terrorists never call themselves as a terrorist” (Medina & Hepner, p.10) . ”Terrorists always fight on the self-proclaimed side of freedom, liberation and label themselves as freedom fighters” (Medina & Hepner, p.10). Concerning the location where the majority of terror attacks happen, it is reported that from 2007 through 2011, most of them took place in states of Africa, Europe, the Middle East and Asia (Medina & Hepner, p. 21). ”This terror attacks in Iraq, Indonesia and Pakistan reflect Islamist or anti-Western activity of al-Qaeda and affiliated organisations” (Medina & Hepner, p. 21). In this essay , there is need to shed light on questions regarding reasons for terror attacks and how the world is fighting against terrorism, especially the challenges for the United Nations and European Union in this global phenomenon.