An air craft that can fly without an egine?

An aircraft that can fly without an engine is known as a glider. Gliders are designed to soar through the air by utilizing rising air currents and thermal updrafts, allowing them to maintain altitude and travel long distances without the need for propulsion. They rely on their aerodynamic shape and wings to generate lift and can be towed into the air or launched from a high point. Once airborne, gliders can glide for extended periods by exploiting natural air movements.