How is digital marketing different from traditional marketing?

To understand what digital marketing actually is it’s important to understand how it is different from traditional forms of marketing.
Digital marketing is different from traditional marketing because it is purely online in digital formats using digital channels and digital content (via content marketing).
Traditional marketing includes offline marketing activities, or in other words, anything that is not online. Examples of traditional marketing are direct mail marketing, billboards, television, radio, trade shows, etc.