A drone is a type of robot that can be programmed to fly in certain path, and follow someone using gps.
They can take pictures and videos, spray crops, and fire weapons. Some also have obstacle avoidance sensors.
A drone is basically a flying robot. Although some are not programmable and only respond to user joystick commands like toy drones.
Example of drones that are considered a robot:
The Mavic 2
Phantom 4 Pro V2.0
These toy drones are not robots:
Holy Stone HS170 Predator Mini RC Helicopter Drone
Cheerwing Syma X5SW-V3 WiFi FPV Drone
DROCON Drone for Beginners X708W
Syma X20 Mini Pocket Drone
Potensic A20 Mini Drone