In volume 7 of the “EICTP Vienna Research Papers on Transnational Terrorism and Counter-Terrorism”, the latest trend-setting developments and phenomena of classic extremist phenomena (left-wing and right-wing extremism as well as Islamism) are presented in a comprehensible and concise manner. In addition, currently emerging forms such as anti-institutional extremism as well as conspiracy- and democracy-rejecting forms are presented and discussed. Furthermore, the current issue contains findings on highly relevant terrorist actors such as Hezbollah, Hamas or the currently significant IS Khorasan Province, prepared by top international experts. The framework is provided by analyses of the conflict-terror nexus, the technology-terror nexus, and the latest challenges and approaches in counterterrorism. Finally, a contribution that comparatively addresses the little-researched area of childhood and adolescence in extremist milieus (right-wing extremism and jihadism) is particularly noteworthy.