This chapter focuses on critical terrorism studies (CTS), which is an investigation into whether terrorism exists at all. These sorts of studies look into the different actors who play a part in different practices and consequences. CTS considers how the construction of the terrorist threat serves specific political, economic, and social functions. Additionally, CTS hopes for a political project aimed at changing the world's policies and practices of security and terrorism. The chapter lists the theoretical foundations of CTS, which derive from post-structuralism and constructivism, and the Frankfurt School's ideas on critical theory. Finally, the chapter shows that terrorism is primarily seen as a political issue under the stance of CTS.