The Sith are an order of Force-sensitive beings who use the dark side of the Force. The title “Darth” is an honorific for Sith Lords, and it usually precedes a symbolic new name.
THE RULE OF TWO
No more, no less. A master, and an apprentice.”
PHILOSOPHY OF THE SITH
The Sith access the dark side of the Force through strong negative emotions rather than the serenity, detachment, and compassion used by the Jedi. In practice, the Sith Code leads to using power for narrow self-interest, breeding infighting and conflict among the Sith. With the Rule of Two, the apprentice is always seeking to overthrow the master.
The Sith Code
Peace is a lie, there is only passion.
Through passion, I gain strength.
Through strength, I gain power.
Through power, I gain victory.
Through victory, my chains are broken.
The Force shall free me.