From about 3500 BCE, in the region of modern Haryana, Punjab, Gujarat and Rajasthan, villages grew into towns, and with increasing trade and other exchanges, those towns further grew into cities. This transition happened around 2600 BCE. Archaeologists have given several names to one of the oldest Civilisation of the world such as ‘Indus’, ‘Harappan’, ‘Indus-SarasvatT or ‘Sindhu- SarasvatT Civilisation and its inhabitants are called ‘Harappans’. This development is also known as the ‘First Urbanisation of India’.