Research: What is the difference between a trailer and a teaser trailer?

The main difference between trailer and a teaser trailer is the hype and the length of the trailer.
A teaser trailer is a lot shorter and punchier. The main aim is to create hype and for people to go mad over social media. However a trailers main purpose is to get people to go and watch the film. Whereas a teaser trailer is to advertise more and to access the target audience.