Arahat

In the sramanic traditions of ancient India (most notably those of Mahavira and Gautama Buddha) arhat (Sanskrit) or arahant (Pali) signified a spiritual practitioner who had—to use an expression common in the tipitaka—"laid down the burden"—and realised the goal of nibbana, the culmination of the spiritual life (brahmacarya). Such a person, having removed all causes for future becoming, is not reborn after biological death into any samsaric realm.
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A term used primarily in Theravada Buddhism to signify a person who has fulfilled its ultimate goal, the attainment of nirvana . Upon death, the arhat will become extinguished. The arhat, as an individual, has attained full enlightenment , peace and freedom. This should be contrasted to Mahayana Buddhism, in which the ultimate goal is to become a bodhisattva --someone who uses the power they gain from enlightenment to help others.