"Ultralight vehicle pilot certificate" is the umbrella term covering drones as well as paragliders, light sport aircraft, and other ultralight vehicles. The certificate for flying a drone (multicopter) specifically — commonly called a "drone license" — is formally the "multicopter pilot certificate."
How the two terms relate
In other words, the multicopter certificate is one specific item under the broader ultralight vehicle pilot certificate system. Ultralight vehicles also include hang gliders, paragliders, and powered paragliders, each with its own separate certification process.
A common source of confusion
Because training institutes and official notices often use the two terms interchangeably, people researching a license for the first time often aren't sure whether "ultralight vehicle certificate" and "drone license" mean the same thing.
It's worth confirming exactly which aircraft you want to be certified for. If your goal is drone training specifically, using the formal term "multicopter pilot certificate" when contacting a training center avoids any confusion.
