Teaser trailers Vs Full theatrical trailers

There are two main types of trailers. Teaser trailers and full theatrical trailers.

TEASER TRAILER 
(Cloverfield, 2008)



Teaser trailers generally show very little of the plot, and have very little, if any of actual movie footage. They usually have a single exciting incident to engage the audience, and to promote interest in the film. They are often very short, sometimes as little as 30 seconds, but can be up to 2 minutes. They are released very early on in the films production, often before the film has finished being filmed in order to get a 'fan-base' and interest from very early on.


FULL THEATRICAL TRAILER
(Coverfield, 2008)



The full theatrical trailer is released a lot closer to to the movie's release. They show more of the plot, and a lot of action to engage the audience. They can be anywayer from a minute in length to 5 minutes. There are often muliple trailers released for a movie, often in a similar style, but showing different footage.