India – People | Britannica

India is a diverse multiethnic country that is home to thousands of small ethnic and tribal groups. That complexity developed from a lengthy and involved process of migration and intermarriage. The great urban culture of the Indus civilization, a society of the Indus River valley that is thought to have been Dravidian-speaking, thrived from roughly 2500 to 1700 bce.

https://www.britannica.com/place/India/People