Zoroastrianism, is the ancient pre-Islamic religion of Iran that had survived there and in isolated areas in India where the descendants of Zoroastrian, Iranian Persian immigrants are known as Parsis or Parsees.
The Iranian prophet and religious reformer Zarathustra flourished before the sixth century BCE and is more widely known outside Iran as Zoroaster, the Greek form of his name. He is traditionally regarded as the founder of the religion. Zoroastrianism contains both monotheistic and dualistic features. It influenced other major Western religions such as Judaism, Christianity and Islam.
Like the Bible, the Avesta is a collection of variety of text composed over what appears to be a considerable span of time by different authors, which is endured editing and reduction at several points during the history of its development. The text that is now in existence represents a fragment of what remained in the ninth century. It contains matter of great antiquity, which are the Gathas, or songs of the prophet Zarathustra or Zoroaster. The Gathas contain expressions of Zarathustra’s religious vision in which in many ways is a complicated reinterpretation of inherited Iranian religious ideas. The Yashts are collections of verses dedicated to the various deities. They have little to do with anything specifically Zoroastrian. The gods invoked are usually the gods of pre-Zoroastrian Iran. There is little agreement as to when Zarathustra lived though most scholars agree that he lived sometime between 1200 and 600 BCE.
Zoroastrianism, is one a of the world's oldest extant religions, "combining a dualism and eschatological monotheism dualism in a unique manner among the major religions of the world, It exalts a deity of wisdom.