The concept of working with young people in recent years has been more focused than it was about thirty years ago. Because of that, systematization of previous research and conclusions has to be made to increase awareness of the importance of investing in youth and systematic and comprehensive work with them. Research has shown that programs which are involved youth work contributed youth development (Merton, 2004). In that research, young people says that participation in youth program was the result of their greater self-confidence. Also, participation in the youth programs provided the opportunity to create friendly relationships and developed new skills (Merton, 2004). The concept of youth work can be viewed through the prism of various psychological, sociological and even pedagogical theories. In this paper will be looking at the definitions of youth work as well as the classification of youth work. In the definition of youth work, there is no consistency between countries as there is no consistency when it comes to defining the youth group. There is also a lack of alignment between states on the professionalization of youth work, but also the formal education and competencies of people working with youth. The Republic of Croatia is also among the countries that have not yet recognized the importance of working with young people. Here is a lack of legislation, and a full range of practical standars related to youth work, which is a potential space for progress and the impact of social workers.