Once upon a time, Zoroastrianism, based on the teachings of the prophet Zoroaster, was one of the world's largest religions. It was a dominant religion up to the 6th century BCE in the eastern part of ancient Greater Iran. Later, with the spread of Islam, this ancient religion got marginalized.
In Zoroastrianism, Ahura Mazda is believed to be the beginning and the end, the creator of everything that can and cannot be seen, the Eternal, the Pure and the only Truth. Ahura Mazda was perceived to be the creator of only the good that will ultimately triumph. The followers of Zoroastrianism believe in good thoughts, good words and good deeds.
Currently, over 20,000 Zoroastrians are left in Iran. Over years, most of them have migrated to other countries. In India, a small religious community that follows Zoroastrianism, exists mostly in Mumbai. The followers are called Parsis because the religion arrived in India from Persia. Their God is represented in their temples through fire, which symbolizes light. For, Indian Parsis, the holiest place is the village of Udvada in Gujarat.