Explanation:

After the collapse of the Indus Valley Civilisation, which ended 1900 BCE, groups of Indo-Aryan peoples migrated into north-western India and started to inhabit the northern Indus Valley. Vedic period or Vedic age is the period in the history of the northern Indian subcontinent between the end of the urban Indus Valley Civilisation and a second urbanisation which began in the central Indo-Gangetic Plain c. 600 BCE. It gets its name from the Vedas, which are liturgical texts containing details of life during this period that have been interpreted to be historical and constitute the primary sources for understanding the period. The end of the Vedic period witnessed the rise of true cities and large states (called mahajanapadas) as well as srama?a movements (including Jainism and Buddhism) which challenged the Vedic orthodoxy.