Difference Between Theatrical Trailer and Teaser Trailer

Producers use teaser trailers to tease their potential audience, they are usually realised months before the official film release, which creates anticipation and entices the audience and leaves them wanting more. Whereas a theatrical trailer - which is released later in the filming/production process is more in depth and starts to create a sense of story and plot.

The most evident difference between a teaser and theatrical trailer is the length. A teaser trailer is usually under 2 minutes, whereas theatrical trailers are under 3 minutes. A teaser creates more mystery as at the point of production there is usually not enough footage to create a theatrical, therefore there is a lot less footage to work with and present to the audience.
Both teaser and theatrical trailers usually place a lot of focus onto the famous actors in the film, to gain an immediate interest from the audience.