You mean to say E-Commerce or online shopping in field of marketing. I Think there are big role of e-commerce in online marketing now days. Online commerce is becoming more widespread as more consumers look to the Internet for purchasing decisions. Consumers can find a wider variety of goods, often at more competitive prices, than they would at their local brick and mortar retailers. Without a strategic e-commerce marketing plan, a business’s website will fall in among the thousands of other companies selling similar products for similar prices.