Probably an altered form of Drohne from northern Germany, a housing name from a place in Westphalia called Drohne, or a topographic name from a field name of the drōn (e) from Middle Low German, a unit of land. A drone is an unmanned aircraft. Drones are more formally known as unmanned aerial vehicles (UAVs) or unmanned aircraft systems. Basically, a drone is a flying robot that can be remotely controlled or flown autonomously through flight plans controlled by software in its integrated systems, which work together with integrated sensors and a global positioning system (GPS).
The word drone was first used to refer to an unmanned aerial vehicle in 1946, but advances in drone technology in recent years have made the term much more common.