Film trailers are made to give viewers an idea of what a movie will be like and entice them to watch it. They work by showing scenes that provide clues about the genre, actors, plot, and setting. Trailers are normally released a couple weeks before the movie but can be earlier for teaser trailers. Viewers can watch trailers online, on television, or before other movies in theaters. Trailers target all audiences unless age-rated for younger viewers.