The Baha'i faith is a religion founded in 19th-century Persia by Bahá'u'lláh. It is a monotheistic religion that emphasizes the spiritual unity of all humankind. The Baha'i faith teaches that there is one God, and that all major religions are part of a single, progressive process of divine revelation. The Baha'i faith has spread to more than 200 countries and territories around the world, and its followers number in the millions.