It refers to the “eternal” truth and teachings of Hinduism. It can also be translated as “the natural and eternal way to live”. The term is used in Indian languages alongside the more common Hindu Dharma for Hinduism. Sanatana Dharma can also denote the list of ‘eternal’ or absolute duties and practices.
About 6000 years ago, there was only one religion in the whole world, whose name was Sanatana Dharma and also called Vedic Religion. The simple meaning of Sanatan is to live life in the manner described in the Vedas.