A genin is the lowest ninja rank; ninja start in four-man cells, consisting of two teammates and a sensei, in order to experience life under supervision of an elite ninja. The next level is chunin, who serve as team leaders in charge of small teams who need to make decisions. Then, we have jonin, highly-experienced ninja with great skill who serve as military captains. Finally, the kage is the leader and acknowledged as the strongest ninja of the village.

Naruto Characters, by Alvin Wong.