This is a very nasty weapon that you have to be prepared to face. Answer:
Drones are UAVs controlled by an operator;
The drone cannot shoot, only explode when it hits a target (similar to the kamikaze principle);
It causes less damage than a missile, but it is harder to detect by radar and shoot down by air defense;
It also costs 20.000$, which is cheaper than missiles, so the aggressor is actively buying them;
You already know that it makes noise like a moped or a lawn mower;
If you hear it during an air raid, take cover, and avoid administrative, infrastructure, and other important facilities (even bridges and monuments);
If it flies and explodes, DO NOT LEAVE THE SHIELD IN ANY WAY, because they fly in flocks;
If you find yourself on the street, it is better to find a barrier (car, wall, fence) and stand behind it, moving in a reduced silhouette (crouching).
Unfortunately, this is a new type of weapon, so our defenders cannot shoot down all 100%s, although very few of them make it. Be careful during the air raid, especially during cloudy weather and of course... The most important thing is to stay under cover