AnswerThe Aryans, now more generally known as the Indo-Iranians, were ancient inhabitants of southern Russia. Their descendants migrated in successive waves, first into north-western India, then into eastern Iran and finally into western Iran. Their religion was the basis for both Hinduism and Zoroastrianism. The religious belief of the Aryans eventually developed into Hinduism. Today, there are around 950 million Hindu practitioners, making it one of the most followed religions in the world.