The Jedi Sentinel, The Jedi Guardian 
I was once a Jedi Knight, the same as your father.. ―Obi-Wan Kenobi, to Luke Skywalker. A Jedi Knight referred to a member of the Jedi Order, who had completed their Jedi training as a student in the Jedi academy, in addition to one-on-one training as a Padawan and the completion of the Jedi Trials. A noble order of protectors unified by their ability to tap into the power of the Force, the Jedi Order were the guardians of peace and justice in the Galactic Republic. The Jedi Knights were first mentioned in the novelization of A New Hope, ghostwritten by Alan Dean Foster and published in 1976. The Jedi Knight is also a class in the newly released Star Wars MMO, Star Wars: The Old Republic. Both Jedi and Sith use lightsabers as their main weapon. The Jedi's lightsabers emit cool colors, usually blue or green blades (sometimes yellow, or purple, as seen in the case of Mace Windu), while the Sith emit warm colors. Lightsabers can be of many different colors depending on the crystal fixture. A Jedi was a member of the Jedi Order, who studied, served and used the mystical energies of the Force; usually, the light side of the Force. The weapon of the Jedi was the lightsaber, a weapon with a blade made of pure energy. Jedi Knights are the masters of the lightsaber arts. They jump, kick, and flash through the air while using the Force to clear a path in front of them. Jedi Knights have before served as generals, warriors, and guerilla fighters for generations. The Jedi Knight is the guardian of a dream for a better tomorrow. The Jedi Knights are a melee class with some force abilities. Jedi Knights can go down two specialization pathways The Jedi Sentinel for melee DPS (damage per second) and The Jedi Guardian as a melee tank. Neither of the Jedi Knight specializations has healing
http://starwars.wikia.com/wiki/Jedi_Knight http://www.starwars.com/databank/jedi-order http://starwars.wikia.com/wiki/Jedi_Knight https://en.wikipedia.org/wiki/Jedi http://starwars.wikia.com/wiki/Jedi http://swtorhumanrelations.com/2011/12/27/jedi-knight-guide/
types of jedi knights