A trailer is a commercial advertisement, originally for a feature film that is going to be exhibited in the future at a movie theater or cinema. It is a product of creative and technical work.
Frame from the 1956 trailer for the war film Attack!
Walt Disney in a 1937 color trailer for the animated musical fantasy film Snow White and the Seven Dwarfs
Screenshot from film trailer for 1959 North by Northwest
A movie theater, cinema, or cinema hall, also known as a movie house, picture house, picture theater or simply theater, is a business that contains auditoria for viewing films for public entertainment. Most are commercial operations catering to the general public, who attend by purchasing tickets.
Modern cinema auditorium in Madrid, Spain
Rodgers Theatre in Poplar Bluff in Missouri. This Art Deco-style theater opened in 1949.
The view from the projectionist's booth at Ultimate Palace Cinema in Oxford. The projector is displaying the 1997–2012 Universal Pictures logo.
Tuschinski Theatre, in Amsterdam considered as one of the most beautiful movie theaters in the world.