E-commerce refers to the paperless exchange of business information using electronic methods like EDI, email, electronic bulletin boards, EFT, and other network technologies. It provides benefits like non-cash payment options, 24/7 availability, improved advertising and sales, better inventory management, and improved communication. Traditional commerce relies more on in-person interactions, while e-commerce allows for asynchronous electronic transactions without human intervention. The main e-commerce models are B2B, B2C, C2C, C2B, B2G, G2B, and G2C.