A good shopping cart system will have integrated up-sell modules, where a customer is offered an additional purchase (i.e. "do you want fries with that?"). This eliminates leaving many thousands of dollars on the table from people who would have spent more if your shopping cart just gave them the chance.

Electronic Commerce is a marketplace on the Internet. Other references include e-commerce, EC, eCommerce and ecommerce). eCommerce consists of distributing, buying, selling, servicing and marketing services or products over the Internet.

eCommerce includes electronic business applications such as electronic funds transfer, e-marketing, online marketing, supply chain management, online transaction processing, electronic data interchange (EDI), and automated data collection and inventory management systems.