What Online marketing is
A form of marketing that combines traditional marketing principles with the unique interactive qualities of the Internet. The purpose is to deliver products and services that satisfy customers. Online marketers devise plans and campaigns to attract customers to a Web site and to encourage them to register their names or purchase products. There is also a growing number of online marketers that focus on being affiliates (sellers or resellers of information).
The meaning of Commerce
In general it means to conduct transactions online. It is considered a technological term because any kind of commerce conducted online requires a technological application behind it. From a marketing point-of-view, commerce is discussed with reference to the three big C's: content, commerce, and community. These are thought to be the three components driving the new economy.