Hindu religion is the Eternal religion because it embraces all others Hindus believe in the doctrines of samsara the continuous cycle of life, death, reincarnation, and karma the universal law of cause and effect. One of the key thoughts of Hinduism is "atman," or the belief in a soul. This philosophy holds that living creatures have a soul, and they're all part of the supreme soul. The word Hindu is an exonym. This word Hindu is derived from the Indo-Aryan and Sanskrit word Sindhu, which means "a large body of water", covering "river, ocean". It was used as the name of the Indus River and referred to its tributaries. Hindus believe in the importance of the observation of appropriate behavior, including numerous rituals, and the ultimate goal of moksha, the release or liberation from the endless cycle of birth. Moksha is the ultimate spiritual goal of Hinduism.