Teaser trailers are short videos released months or a year before a film's release to generate excitement and anticipation. They are typically 30 seconds to a minute long and may feature unfinished scenes as films are sometimes still in production when teaser trailers are made. Teaser trailers are aimed at sparking interest in the target audience and increasing desire to see the upcoming film.

1. Task 6 – Teaser trailers and the film
making process
By Sam Daniels

2. When Are Teaser Trailers Made?
• A teaser trailer is a short version of a cinematic trailer
which are used to spark interest to the target audience,
getting them excited about the new upcoming film. They
are usually released months or even a year in advance
before the expected release date, which is used to
increase anticipation and desire to see this new film.
• A teaser trailer normally lasts between 30 seconds to a
minute. The trailer is often released before the film is
actually completed.
• Teaser trailers are sometimes made when the film is
actually still in the stage of production or being edited
and therefore may different versions of scenes that are
not in the finished film.
Source: http://www.wisegeek.com/what-is-a-teaser-trailer.htm#

3. A teaser trailer is
released around this
time. The distributor
then commissions this
trailer to go out to the
target audience to enjoy
and indulge.
Production exhibition
The Idea
Pre-Production Sales
A promo trailer is
released around this
time to industry
audiences i.e. the
distributor. This is
commissioned by the
producer