A drone, also known as an unmanned aerial vehicle (UAV), is a remotely controlled or autonomously operated aircraft without a human pilot on board. Drones are equipped with sensors, cameras, and GPS for navigation, data collection, and various applications. They vary in size, from small consumer models for photography to large military drones for surveillance or combat. Powered by batteries or fuel, drones are used in industries like agriculture, filmmaking, logistics, and scientific research. Their versatility, affordability, and ability to access hard-to-reach areas make them increasingly popular for both commercial and recreational purposes.