This made movie producers show trailers before the movies. Since those short previews followed the movies, they were called 'trailers.' As time passed by, people got less interested in watching the whole reel to the end. Producers' argument was simple: to let the person view the film and then get them excited about the next one (like TV-shows nowadays do with their 'coming up' sections). At the beginning of the 20th century, movie producers started getting an idea of placing ads to their future movies at the movies' reels sent to theaters. The term 'trailer' was determined by the history of movie production. The teaser trailer's meaning is basically 'a shorter trailer.' It shows fewer scenes from a movie and is usually done way earlier than a trailer (1.5 or 2 years before the movie release).

Since trailers are designed for advertisement, they should attract viewers and keep them interested in watching the full movie.

They showcase the main characters, plot base, and atmosphere. According to Dictionary by Merriam-Webster, the meaning of the word 'trailer' is 'a selected group of scenes that are shown to advertise a movie.' Generally, trailers are from 1:30 to 2:30 minutes long.

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