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21.What is E-Commerce? Explain its various models. E-Commerce or Electronics Commerce is a methodology of modern business, which addresses the requirements of business organizations. It can be broadly defined as the process of buying or selling of goods or services using an electronic medium such as the Internet. E-Commerce or Electronics Commerce is a methodology of modern business, which addresses the need of business organizations, vendors and customers to reduce cost and improve the quality of goods and services while increasing the speed of delivery. Ecommerce refers to the paperless exchange of business information using the following ways Electronic Data Interchange (EDI) Electronic Mail (e-mail) Electronic Bulletin Boards Electronic Fund Transfer (EFT) Other Network-based technologies E-Commerce provides the following features − Non-Cash Payment − E-Commerce enables the use of credit cards, debit cards, smart cards, electronic fund transfer via bank's web...