In simplistic terms, digital marketing is the promotion of products or brands via one or more forms of electronic media. Digital marketing differs from traditional marketing in that it involves the use of channels and methods that enable an organization to analyze marketing campaigns and understand what is working and what isn’t – typically in real time.
Digital marketers monitor things like what is being viewed, how often and for how long, sales conversions, what content works and doesn’t work, etc. While the Internet is, perhaps, the channel most closely associated with digital marketing, others include wireless text messaging, mobile instant messaging, mobile apps, podcasts, electronic billboards, digital television and radio channels, etc.
Here is a great article I found online on Digital Marketing