Trailers are considered for advertising the film which is usually released weeks or months before a particular movie will be released for public viewing. It is also made of a different sequence of the film that have been properly shown the trailers to generate interest. Another thing about the movie trailers is that they are made to make the public aware of what they should expect from a movie and make them curious to see it. You can find more about movie trailers via fanfestworld.com/category/entertainment/.
Another thing about the movie trailer is that what you actually see in the trailer itself can be seen in the original film. A different order than the original film deliberately together to create the effect that people would be amazed to make them watch the movie when released. Every part of the original movie that has a striking and attractive sequence considered to be part of the trailer.
Their information listed above is a fact and can be based on different movies today. Some movie trailers have several advanced special effects in some scenes that are not planned to be used in the original film itself. This method is effective because it actually increases the hype of the audience that makes itself a blockbuster movie in the end.