What is a teaser trailer

A teaser trailer plays a major role in the marketing side of the film industry as it allows a film/content creator to slightly "tease"/temp any movie goer to viewing the movie.
 The conventions of a teaser trailer are kept pretty simply, with the duration of the teaser trailer being a major practicality of of the conventions, film makers tend to produce a teaser trailer that varies between 60 seconds to 120 seconds in duration. The short duration of the teaser trailer is then used as an essential mechanisms when attract the right demographic as the viewers of the trailer would in turn be persuaded to wanting to watch the full feature length film.
 When creating a teaser trailer it is important the the content creator showcases the right amount of narrative and plot twist in the trailer, if the content creator was to showcase a small amount the attention of the demographic would barely be light thereby causing audiences to not be interested  to watch the film, in addition to this if the content creator was to showcase to  much of the narrative in the teaser audiences may believe that they would not need to watch the film because they believe that they already know the story line and wouldn't want to spend money to watch the actual film. If the content creator was to showcase just the right about to make the teaser ambiguous but still quite captivating to make audiences interested on watch the actual film then the content creator has achieved his goal of creating a successful teaser trailer. I am planning on using this technique of my teaser trailer to thereby increase the authenticity of my product.
Above is a teaser trailer for an up and coming horror movie to reach the cinemas. As we can see the teaser is only 137 seconds long which is close to the 120 seconds rule I had mentioned earlier in this post. From this 137 second long trailer we that audience are introduced to some of the themes are and narrative of the film, from the teaser we are introduced to enough of the narrative that we know the basic outline of the narrative whilst the teaser is still ambiguous as we are not informed of the events that lead up to the graphic scenes that are showcased near the end of the teaser.
 We can see that Todorov's theory on narrative has been applied to this trailer this is evident due to the beginning of the teaser portraying the equilibrium; the part of the narrative where the characters are living out their normal lives unaware of any of the danger they are about to face this is highlighted between the 0:00-0:29 of the teaser were we see our to main characters enjoying each others company whilst a peaceful backing track is played in the background to connote the sense of stability. This stability is disrupted at 0:46 were the disruption appears the characters are put in unrest by this disruptions and are now aware that they might be in danger, but that is as far as Todorov's theory of narrative is applied to this teaser; then rest of the teaser showcases different points of the disruption section in the film, this was done by the content creator as a way to ease the audience to watching the film in cinemas, as the ambiguity of the characters fate will then captivate the audience to sit through the entire film. As I had mentioned before this technique plays a major role in the marketing side of film making and would be the technique that I am applying to my teaser.