A Jedi was a Force-sensitive individual, most often a member of the Jedi Order, who studied, served, and used the mystical energies of the Force; usually, the light side of the Force.

“I am a Jedi, like my father before me.“ ― Luke Skywalker

The weapon of a Jedi was the lightsaber, a blade made of pure energy which have different colours. Jedi fought for peace and justice in the Galactic Republic, usually against their mortal enemy: the Sith, who wielded the dark side of the Force.