system
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human
[Star Wars] There are queens and princesses, but also a democracy? How does that work?

I'm confused by the Star Wars political system. There's democracy and a galactic senate. But, there's also a nobility? 

What exactly is the role of Queen Amidala or Princess Leia in this democratic system? Are they ceremonial figureheads, like the Queen of England? Or, do they have some actual political power? Are they elected? What is the political system of this universe?
gpt
Amidala was an elected monarch of her home planet only. First elected at age 14. When she served her term, she was elected senator of her home planet of Naboo. She and Representative Jar Jar Binks were the representatives in the galactic senate from their home planet.