The retail industry in India has evolved from traditional barter and kirana stores to modern retail formats like supermarkets and hypermarkets. It currently accounts for 24% of India's GDP and is the fifth largest retail market in the world, though organized retail makes up only 5-7% of the sector. Major players in Indian retail include Pantaloons, Shoppers Stop, and Trent. The industry faces opportunities for growth from rising incomes and urbanization, but also challenges from a fragmented supply chain and lack of infrastructure.