E-commerce involves trading products and services over computer networks. It draws from concepts like mobile commerce, electronic funds transfer, supply chain management, and internet marketing. There are different models like on-premise, software as a service, and open source e-commerce. Sales can be business-to-business, business-to-consumer, consumer-to-consumer, or consumer-to-business. Amazon was founded in 1994 and started in founder Jeff Bezos' garage with a few employees developing software. Amazon went public in 1997 and has grown significantly, with yearly sales jumping from $510,000 in 1995 to over $17 billion in 2011.