What Is a UAV ?
An unmanned aerial vehicle (UAV), known in the mainstream as a drone and also referred to as an unpiloted aerial vehicle and a remotely piloted aircraft (RPA) by the International Civil Aviation Organization (ICAO), is an aircraft without a human pilot aboard. ICAO classify unmanned aircraft into two types under Circular 328 AN/190:
Autonomous aircraft – currently considered unsuitable for regulation due to legal and liability issues
Remotely piloted aircraft – subject to civil regulation under ICAO and under the relevant national aviation authority