Radicalization is increasingly becoming a mainstream word, and is due to the current terrorist-related attacks within Europe in every-day discourse, as well as its indispensable use in scientific debate. Extremism and radicalization are concepts that are defined differently and are therefore also difficult to grasp. In the first part of this thesis, the main focus is on the clarification of the different terms. The main section deals with the motives of young people who enter into extremist youth groups, in particular, the possible driving influences will be presented. The focus is on right-wing as well as neo-Salafist youth cliques. Different influencing factors for radicalization are to be presented and the similarities and differences are to be worked out. Finally, youth work is to be presented as a possible effective approach in working with young people who are impacted by radicalization.