Positive psychology deserves to be a major force in contemporary psychology. Positive psychology provides a common identity for all scholars and practitioners interested in human flourishing and well‐being. One of the key developments over the past 10 years has been the shift in emphasis from hedonistic well‐being to eudaimonic well‐being. The importance of this development of interest in eudaimonia is twofold. First, it has widened the scope of positive psychology so that it is no longer as concerned with happiness in the traditional sense of joy and pleasure but also with the existential concerns of meaning and purpose. Second, it has allowed positive psychology to build bridges. Positive psychology must recognize that its topics of interest date back to humanistic psychology and even beyond to the origins of psychology itself. This chapter also presents an overview of the key concepts discussed in the other chapters of the book.