This literature review critically investigates the evolving nature of terrorism as a non-traditional security threat in the contemporary global system. Drawing upon recent literature and empirical data, this paper explores the ideological, technological, and geopolitical transformations that shape terrorism as a persistent, adaptable, and cross-border phenomenon. This review emphasizes the shift from politically motivated attacks to religious extremism, digital propaganda, and regional instability, particularly in Southeast Asia. Furthermore, it reveals how non-traditional security challenges, such as terrorism, have redefined national and regional policy agendas. It also highlights the role of regional cooperation, ideological narratives, and digital technology in counter-terrorism strategies.
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