Аннотация. This research provides a deep and comprehensive exploration of terrorism and counterterrorism within cyberspace, elaborating on the growing transition from traditional terrorism (which is characterized by real-world violent actions) to cyberterrorism, where attacks are carried out digitally to mess with or break critical infrastructure and cause localized or widespread harm. Moreover, this paper argues that collaborative international strategies are more effective at countering cyberterrorism than isolated national approaches. It examines several cases to show the evolution of this kind of threat, which shocked the world and reshaped global counterterrorism strategies both in the physical and cyber domains. By diving into these incidents, the research will highlight the methods and strategies used by terrorist organizations to achieve their main goals, whether through physical violence or advanced cyberattacks. It underlines the diverse and various approaches used by cyber terrorists, which exploit vulnerabilities in digital systems to maximize impact. Moreover, the paper also explores the measures taken by nations to defend their national security. By analyzing different real-world cases, it examines how international collaboration, advanced technologies, and dedicated counterterrorism initiatives are implemented and used to mitigate these threats. Attention is also given to the role of artificial intelligence and global information-sharing platforms in detecting and preventing potential attacks. This research aims to provide a comprehensive understanding of the connection between terrorist activities and counterterrorism strategies, focusing on the need for innovative, new solutions to quickly adapt to evolving threats. Examining real-world examples and defensive measures gives valuable insights into securing the digital domain against emerging challenges and problems.