Which type of aircraft is characterized by rotating wings?

The correct choice pertains to helicopters, which are distinctly recognized by their rotating wings, known as rotor blades. Unlike fixed-wing aircraft, which rely on a stationary wing structure for lift, helicopters utilize these rotating wings to generate the necessary lift for vertical takeoff and landing, as well as for horizontal flight. The rotation allows for greater maneuverability and the ability to hover in place, which are essential characteristics of helicopter operation.

In comparison to airplanes and fighter jets, which rely on fixed wings for aerodynamics and require forward motion to generate lift, helicopters can take off and land vertically and can fly in tighter confines. Gliders, while they also have wings, do not have any propulsion system that rotates; instead, they rely on thermal currents and gravity to glide. This distinction emphasizes the unique functionality and design of helicopters in relation to other types of aircraft, underscoring why they are defined by their rotating wings.