A drone in music is basically one note or sound that's held for a long time without changing. Just like how you hold onto your favorite toy or teddy bear and don't want to let go, the drone note stays the same and doesn't want to change.
Think of it like a humming sound that you might make when you're bored or trying to fall asleep. The humming sound is like a drone note because it's a single sound that you keep repeating.
Sometimes, musicians use drones to create a specific feeling in their music. For example, some musicians might use a drone note to make their music sound sad or serious.
Overall, a drone note in music is just a single sound that's held for a long time without changing, like your favorite toy that you hold onto tightly.