Drone Anatomy

Drones can be categorized by number of propellers, size, range, etc. Figure below shows a drone with 4 propellers, hence a quadcopter. 

In terms of size, there are nano drones, mini drones, regular size drones and large drones. In addition, drones can also be categorized based on distance its travel such as close range, short range, mid range and endurance range drones.