Dark Jedi were Jedi who chose to deny the light side of the Force and follow the dark side of the Force. Dark Jedi were not the same as Sith (though the original Dark Jedi were their predecessors), but some, such as Darth Vader, practiced both Dark Jedi and Sith techniques. While Jedi were capable of falling to the dark side, it was also possible for a Dark Jedi to be redeemed in the light, as Luke Skywalker helped Kam Solusar to do.