The document discusses the early civilizations of ancient India, including the Indus Civilization from 3300-2400 BCE centered around the cities of Mohenjo-Daro and Harappa. It then discusses the later Vedic period from 1200-600 BCE, during which the Hindu religion was established through sacred texts known as the Vedas, written in Sanskrit. These texts included hymns, prayers, and discussions around beliefs, gods, sacrifices and the establishment of the caste system in Hindu society.