Originally, a trailer was a film preview, which was shown at the end of a film. It was a way to encourage the audience to leave the theater. Eventually, trailers also served as a way to advertise upcoming films.

A trailer is a short version of a film that usually runs between 1 and 2 minutes and 30 seconds. The trailer consists of sequences from the film in order. In most cases, the trailer is created after the film has been edited. It contains little information about the movie, but it does give an idea of the plot.

Movie trailers are popular on Blu-ray discs and on the Internet. They are also used by many movie production companies for advertising their upcoming movies. Trailers are also a popular method for showing short demos for computer games. They have become so popular that movie trailers rank third among the most watched videos on the Internet.

A trailer usually follows a non-linear structure. It can be a single frame, or it can be divided into several frames. Trailers can be closed or open, and they can be flat deck or curtainside. A trailer can also be used for storing or carrying equipment, food, and materials. They can be towed by a car or truck.

Trailers typically have two or more axles. They may be flat deck, curtainside, or hardside. Trailers may also be towed by a tractor. Horse trailers are another type of trailer, designed to make it comfortable for horses to travel in. They are usually equipped with windows and adjustable vents.

Trailers also have a braking system. Trailers over 8,000 pounds require electric brakes, and trailers with GVWR of more than 3000 pounds require air brakes. The brake system must be able to safely control the trailer’s movement. It may also require fish plates at stress points.

A trailer can be designed to have a low tongue weight, enabling it to be moved forward. However, a trailer with a low tongue weight should be able to carry an evenly distributed load. If the tongue weight is too low, the trailer may need to be moved back. If the trailer is overloaded, it may need to be secured to prevent it from moving out of place.

Trailers have been used since 1912. They were used for verbal communications, and were also used to trail feature films. They were printed on the trailing portion of the feature print stock. They were also used as a way to protect the print. They were also used to show films to audiences at the beginning and end of the film, and to attract them to the theater.

The trailers produced by the major studios are usually around four minutes long. These trailers are typically produced for the distributor’s most high-profile release. Movie trailers are also very popular on Blu-ray discs, and they rank third among the most watched online videos. Movie trailers are also used to estimate the film’s profit.