The term 'INDO-ARYAN LANGUAGE GROUP' refers to a GROUP of languages that are related to each other and are spoken in South Asia. This LANGUAGE GROUP includes Sanskrit, Hindi, Urdu, Bengali, Punjabi, Gujarati, Marathi, and Nepali. These languages are descended from the Proto-Indo-ARYAN LANGUAGE, which is believed to have been spoken in the Indian subcontinent around 2000 BCE. The Indo-ARYAN LANGUAGE GROUP is one of the most widely spoken LANGUAGE groups in the world, with over 1 billion speakers.