"Drone" covers all UAVs/RPVs whether small enough to fit on your palm or large enough to need a full size air strip to launch.
All UAVs are drones and all drones are UAVs. Not all drones are quadcopters but all quadcopters are drones. Even in the strictest definition, what we commonly call "R/C Planes/Helicopters" actually qualify as "drones."
All UAVs are drones and all drones are UAVs. Not all drones are quadcopters but all quadcopters are drones. Even in the strictest definition, what we commonly call "R/C Planes/Helicopters" actually qualify as "drones."
https://en.wikipedia.org/wiki/Unmanned_aerial_vehicle