Online Marketing is the big overall umbrella term for all types of online marketing efforts:

Search Engine Marketing   Referrers and Links   E-Mail & Newsletters   Banner Advertising

Banner advertising is one of the oldest forms of online marketing and dates back to the early days of the web, almost as old as referrer marketing. Banner Advertising is sold in a number of ways, including:
  • Pay-per-impression
  • Pay-per-period (month, week, quarter etc)
  • Pay-per-click
  • Pay-per-action