Helicopter also known as chopper, is a multipurpose flying machine which has two blades on the top, which, by its rotational movement help the helicopter to lift itself in the air. A helicopter has a different structure, size and working principle than the airplane. The major difference is that of the absence of wings as it uses blades on the top instead.

A helicopter, also known as a chopper, is a kind of rotor craft wherein lift and thrust are sent by one or more engine driven rotors. In contrast with fixed-wing aircraft, this allows the helicopter to take off and land vertically, to hover, and to fly forth, back and laterally. These attributes permit helicopters to be used in crowded areas where fixed-wing airplane would not be able to take off or land.