This thesis explores the role of artificial intelligence (AI) in strengthening national security, witha particular focus on the prevention of terrorist threats. Through the analysis of various AI technologies, such as machine learning, big data analysis, natural language processing and computer vision, the paper shows how these technologies have become crucial for security agencies in identifying and suppressing terrorist activities. The paper begins with an overview of contemporary challenges in global security, highlighting how terrorist organizations have adapted to the use of the Internet and social networks to spread their ideologies and organize attacks. In response, national security agencies have turned to artificial intelligence to improve their capacity to analyze large amounts of data and identify patterns that indicate potential threats. The central part of the work focuses on practical applications of UI in security systems, including analysis of data from social networks, predictive analytics, facial recognition and filtering terrorist content from the Internet. Predictive models are particularly useful for analyzing historical dataon terrorist activity and predicting future threats. Along with the benefits, the challenges of using UI, such as privacy and ethical issues, are also highlighted. The use of AI for mass data analysis can violate the privacy of citizens and open the possibility of misuse of collected information, which confirms the need for stricter ethical and legal frameworks. As a practical example, the paper analyzes TikTok, a platform that, despite its popularity, has become a space for the spread of extremism. The Hatescape report shows that a significant percentage of content on TikTok is related to extremism, including 24% of videos glorifying terrorists. In response, an application that uses UI to identify and remove terrorist content on TikTok was developed, showing how UI can be a tool to counter terrorism on social networks, but also highlighting the need to regulate its use. 56 In conclusion, the paper points out that, although artificial intelligence is a powerful tool in the fight against terrorism, its application must be regulated to ensure the protection of human rights and ethical standards. International cooperation and a balanced approach are needed for the effective use of AI in security systems.