Hinduism is an umbrella term for a range of Indian religious and spiritual traditions (sampradayas) that are unified by adherence to the concept of dharma, a cosmic order maintained by its followers through rituals and righteous living, as expounded in the Vedas. The word Hindu is an exonym, and while Hinduism has been called the oldest surviving religion in the world, it is also described by the 19th century term Sanātana Dharma. Vaidika Dharma and Arya Dharma are historical endonyms for Hinduism.