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In the fictional Star Wars universe, the Sith were a humanoid race who were enslaved by a group of warrior priests who follow the dark side of the Force and serve as the evil counterparts to the Jedi. Those Dark Jedi became known as "Sith Lords". Sith Lords often adopt names which are preceded by "Darth".
"Always two there are, no more, no less: a master and an apprentice." - Yoda
http://en.wikipedia.org/wiki/Sith
All you need to know about what a sith is, is in the link.