Zoroastrianism is an ancient monotheistic religion founded by the prophet Zoroaster in Persia. It believes in one supreme creator God called Ahura Mazda who is eternal and battles the destructive spirit Angra Mainyu. Followers aim to combat evil through good deeds, thoughts, and works to attain salvation after death. Rituals include daily prayers before a sacred fire and rites of passage like receiving special clothing at age 7-10. Though once a major world faith, only around 200,000 Zoroastrians remain today primarily in India and Iran.