THE TEACHING THAT CANNOT BE SEEN - Informal Education in the XXI centu ry - This book studies the influence of the media in the present socie ty as well as the appearance of new agents that enter in action throug h new technologies of the digital society of the XXI century. It also explains the daily but hidden action of informal education, contributi ng and upgrading some key elements, ideas and reflections and offering examples, tools and solutions for group work in the formal as well in the non formal education. The Teaching that cannot be seen, is an ind ispensable document for those educators who want to know the action, s ometimes contrary, that the audiovisual means and the new technologies carry out through informal education. The book also contributes an im portant brand of reflection for communication professionals in underst anding the educational implications that social communication has in i nformal education. Finally, it offers a theoretical base on the inform al educational agent