Ninjutsu (meaning "Ninja Technique") refers to any technique that utilizes chakra and allows the user to perform actions that a person otherwise would be incapable of doing. Unlike genjutsu, which causes the opponent to experience illusions, the effects of ninjutsu are real. Ninjutsu relies on chakra and, most of the time, hand signs to be effective. The hands are put in sequential positions that molds and manipulate in the necessary manner to perform a jutsu. This is not always, however, and some jutsu become second nature to experienced ninja, after which they can perform them at all. Additionally, many ninjutsu can be classified as an elemental jutsu, in those cases where a specific element (wind, water, fire, earth, lightning) is used.