This is the first book that explicitly focuses on the relationships between various types of friendship experiences and happiness. It addresses historical, theoretical, and measurement issues in the study of friendship and happiness (e.g., why friends are important for happiness). In order to achieve a balanced evaluation of this area as a whole, many chapters in the book conclude with a critical appraisal of what is known about the role of friendship in happiness, and provide important directions for future research. Experts from different parts of the world provide in-depth, authoritative reviews on the association between different types of friendship experiences (e.g., friendship quantity, quality) and happiness in different age groups and cultures. An ideal resource for researchers and students of positive psychology, this rich, clear, and up-to-date book serves as an important reference for academicians in related fields of psychology such as cross-cultural, developmental and social.