Extracurricular youth education is an independent educational and pedagogical field with a wide range of offerings and institutions, providers, and structures. It has a recognized level of professionalism and expertise. As a pluralistic educational and experiential world, it belongs to the realm of non-formal education, featuring its own settings and formats, learning locations and times; it is characterized by a variety of content, themes, and methods. The handbook represents the current state of discussion and knowledge in extracurricular youth education; for the first time, it expresses the full breadth and vitality of the field. The contributions provide a vivid affirmation of the potentials and activities, as well as the results and impacts of an educational field that confidently engages in further professional and public discourse.