Interruption Marketing
Facebook ads, Google Display ads, email ads, direct mail ads, radio and tv ads, billboards and signs are all examples of Interruption Marketing.
With Interruption Marketing, you are trying to get in front of people and interrupt them, catch their attention, and then hold it.
Interruption Marketing media can also be expensive. Not because it's the highest price tag though. It's often the *cheapest way to reach a lot of people, but it can have the lowest ROI (return on investment).
(*Online media is often relatively cheap - offline media is often not cheap. Then again, it's not about the cost...it's about the ROI, isn't it?)
The downside of Interruption Marketing is that while the online media is often cheaper to buy, you have to figure out how to quickly create an overwhelming desire to buy (or at least research) something they were not looking for the moment you got their attention.
The upside is that if you figure out how to effectively convert un-interested or "cold" prospects into customers, your business will explode!