State-backed network ONDC has crossed the 200 Mn transactions milestone over 2 years after starting operations.It took ONDC 20 months to reach 100 Mn transactions, while the next 100 Mn transactions were achieved in just six months.ONDC is seen as a paradigm shift in the way buyers and sellers view digital commerce.Despite challenges, experts believe there is significant potential for ONDC's growth in the booming Indian ecommerce market.