E-commerce is widely considered the buying and selling of products over the internet, but any transaction that is completed solely through electronic measures can be considered e-commerce. E-commerce is subdivided into three categories: Business-To-Business or B2B (Cisco), Business-To-Consumer or B2C (Amazon), and Consumer-To-Consumer or C2C (eBay). Also called electronic commerce. M-commerce is a term that is used to refer to the growing practice of conducting financial and promotional activities with the use of a wireless handheld device.