In 2008, in an interview with CNN's Dan Rivers, Imam Samudra, the main actor in the 2002 Bali bombing in Indonesia, said he did not would never apologize to the non-Muslim victims of the tragedy. His reason was that his religion, Islam, based on his interpretation and understanding, allows him to kill infidels (CNN, 2008; Rivers, 2008). Furthermore, Imam Samudra considered his actions as jihad meaning “obligation to fight a limited war” (Hassan, 2007). In the same interview, Amrozi, Imam Samudra's fellow terrorist, showed a happy face and said "Alhamdulillâh", meaning "thank God", when Rivers showed photos of the victims and some other images related to his terrorist act in Bali (CNN, 2008). Using Kaplan and Weinberg's (1998) approach to extremism, Samudra and Amrozi's way of thinking obviously demonstrated that they are extremists, especially in terms of their antagonism with other groups based on their moral legitimacy. But, by the same token, they are clearly condemned as terrorists. How are the terms extremism and terrorism actually related? This short article will try to answer the question by discussing the ratio that although all terrorists are extremists, not all extremists are terrorists. In addition to providing clear definitions on these terms, this essay will also try to explain and evaluate the definitions through arguments and examples. The terms or behaviors of extremism and terrorism may share some similarities, but, in reality, they have subtle differences. Perhaps it is more understandable that all terrorists are extremists, but the question that might arise is: does employing an extreme religious, political or ideological view necessarily imply terrorism? Some scholars may argue that the terms extremism and terrorism are difficult to define (Juergensmeyer, 2003). However, borrowing Pressman and Flockton's (2014) view on the terms, it is more likely to be acceptable that, while extremism does not require violent action, terrorism always requires violence to achieve some political objectives (p. 123). According to Kaplan and Weinberg (1998) extremism is a perspective that defines reality simply in two opposite categories, black and white, right and wrong, good and evil. They stated that “[i]t is a perspective…built around monism and moralism that rejects ambiguity” (p. 11). This means that the extremists' views on these categories are rigorous and uncompromising. Furthermore, they put themselves on the side of "good" while pointing out others as "wrong" or "bad".””.