Ruling

Darth Vader: Together we will rule the universe, as father and son.

(The Empire Strikes Back)

The quote listed here presents the idea of 'ruling'... but what exactly does this entail?
Being in charge?
Having power?
Prestige?
Authority?
Ordering people around?

Is this something worth having? Is it something you would want to do? What purpose does it serve?
Why would anyone choose to be in charge?

What is power? What is position? What does a ruler do?