E-commerce (electronic commerce or EC) is the buying and selling of goods and services on the Internet, especially the World Wide Web. In practice, this term and a newer term, e-business, are often used interchangably. For online retail selling, the term e-tailing is sometimes used.

E-commerce can be divided into:

• E-tailing or "virtual storefronts" on Web sites with online catalogs, sometimes gathered into a "virtual mall"
• The gathering and use of demographic data through Web contacts
• Electronic Data Interchange (EDI), the business-to-business exchange of data
• e-mail and fax and their use as media for reaching prospects and established customers (for example, with newsletters)
• Business-to-business buying and selling
• The security of business transactions