Reincarnation is the religious or philosophical concept that the soul or spirit, after biological death, begins life in a new body that may be human, animal or spiritual depending on the moral quality of the previous life's actions. This doctrine is a central tenet of several religions including Buddhism and Hinduism. It is also a common belief of various ancient and modern religions such as Spiritism, Theosophy, and Eckankar and is found in many tribal societies around the world.