IDEOLOGY
The Hindutva ideology, also called Hindu nationalism — distinct from Hinduism, which stresses ideals of brotherhood and Vasudeva Kutumbakam (meaning: though nations might be mired in conflict, civilizations co-exist) — was popularised by Vinayak Damodar Savarkar. It is a modern political ideology that advocates Hindu supremacy and seeks to transform India into a Hindu nation. More details here.