Robots are equipped with the ability to sense, process, and record the world around them. Robots can go places humans cannot go, see things humans cannot see. Robots are, first and foremost, a human instrument.
Drones are probably the most advanced equipment in the field of robotics, aeronautics and electronics.
The use of drones has grown quickly in recent years because unlike manned aircraft they can stay aloft for many hours; they are much cheaper than military aircraft and they are flown remotely so there is no danger to the flight crew.