Both land and sea trade were good things in India. Because Asoka wanted to keep in touch with his empire there are several well made roads going all across the country. This included the Silk Roads which where a vast network of caravan routes where silk was traded Also they have many trade routes off of the coast to reach other countries. Because of trade they spread two religions(Hinduism and Buddhism), learn a lot about astronomy, and gained much knowledge from other countries like Greece.