These blades are on top of the helicopter. The helicopter engine turns the blades round and round in a circle. The turning blades lift the helicopter into the air. When taking off or landing, helicopters can fly straight up and straight down. While in the air, they can hover, or stay in one place.
Helicopters can take off and land anywhere.
They do not need a runway like airplanes do. People use helicopters to do many jobs. Traffic reporters in helicopters check traffic on busy highways. Paramedics rescue accident victims in helicopters and fly sick people to hospitals. The Coast Guard looks for boats disabled at sea.