Ecommerce is defined as using electronic communication and digital information to conduct business transactions. The document discusses the types of ecommerce including business-to-business, business-to-customer, customer-to-customer, and business-to-government. It also outlines essential factors for ecommerce growth in India such as cash on delivery, replacement options, feedback, tracking orders, and multiple payment options. The sectors discussed include retailers like Flipkart, as well as travel, matrimonial services, job searching, and online ads. Opportunities exist for retailers, sellers, and individuals, while challenges include logistics, cyber crimes, and tax collection. The future of ecommerce is predicted to include increased use of smartphones