This document provides an overview of key aspects of Zoroastrianism, including: 1. Scholars debate whether Zoroastrianism originated in the 6th century BCE under Zoroaster or earlier. 2. Zoroastrian scriptures describe an early pastoral society. 3. Zoroastrianism spread during Persian empires but declined after the Muslim conquest of Persia. 4. Core beliefs include a cosmic dualism of good and evil and life after judgment of the soul.