Original: In ', Palpatine (Ian McDiarmid), who is really the Sith Lord Darth Sidious, manipulates Anakin's love for Padmé in order to turn him to the dark side and become his apprentice, Darth Vader.
Simplified: In the fictional Star Wars universe, the Jedi or Jedi Knights are members of an old order, who use a power they call The Force.