Electronic commerce, e-commerce or ecommerce consists primarily of the distributing, buying, selling, marketing, and servicing of products or services over electronic systems such as the Internet and other computer networks. The information technology industry might see it as an electronic business application aimed at commercial transactions.
Permission marketing is a term used in e-marketing. Marketers will ask permission before they send advertisements to prospective customers. It is used by some Internet marketers, email marketers, and telephone marketers. It requires that people first "opt-in", rather than allowing people to "opt-out" only after the advertisements have been sent.