Garth'zel blinks slowly at him for his question. "How do you not know--I'll be back."

He wants a drink for this. He soon returns with a mug of something with what he hopes is enough of an alcoholic content for this conversation, sitting in a chair after shooing a pair of kittens off it. "The Sith use the Dark Side. Some consider us to basically be the Jedi's opposites."

To give a very basic idea.