Zoroastrianism is one of the oldest religions in the world. Historians believe that Zoroastrianism originated in ancient Persia around 4,000 years ago.
Believers in Zoroastrianism follow the teachings of a prophet known as Zoroaster or Zarathrustra. Today, most Zoroastrians live in India and Pakistan, as well as Iran, where they are considered a religious minority. Zoroastrianism began in what is now northeast Iran and southwestern Afghanistan, and it was the first major religion to worship a single deity rather than many gods.