E-commerce is defined by Merriam-Webster's Dictionary thusly -
Business-to-consumer and business-to-business commerce conducted by way of the Internet or other electronic networks.
Wikipedia defines E-commerce in this way -
Electronic Commerce, commonly known as E-commerce or eCommerce, is trading in products or services using computer networks, such as the Internet. Electronic commerce draws on technologies such as mobile commerce, electronic funds transfer, supply chain management, Internet marketing, online transaction processing, electronic data interchange (EDI), inventory management systems, and automated data collection systems. Modern electronic commerce typically uses the World Wide Web for at least one part of the transaction's life cycle, although it may also use other technologies such as e-mail.
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