The word "trap" refers to the usage of a trap in which a live bird was placed and released on command and then an attemp was made to shoot it. The earliest printed description of this sport was in Feb. 1793 in England. It became one of England's most popular sports and migrated to the United States in 1831. The evolution of the sport replaced live birds with glass balls and then clay targets. The clay is called a "bird" and the machine which throws the bird is the "trap" and it is housed in a "trap house". The shooter is 16 yards behind the trap house, and targets rise and fly away from the shooter.
A round for one person consists of 25 shots, five each from five shooting stations, the object being to score the greatest number of broken targets.