On hearing the word 'Yoga', images of people wearing different asanas and postures start emerging in the mind. The book 'Yoga Science: Nature, Tradition and practice introduces the theoretical and spiritual side of yoga at the conceptual level. This book, which throws light on the origin, development, description of yoga in ancient scriptures and solution of social problems through yoga, is the result of deep research and study of the senior author Dr. Sitaram Jha 'Shyam'.