Spiritism is a spiritualistic doctrine codified in the 19th century by the French educator Allan Kardec, proposed to the study of "the nature, origin, and destiny of spirits, and their relation with the corporeal world". Spiritism soon spread to other countries, having today 35 countries represented in the International Spiritist Council.
Spiritism postulates that humans are essentially immortal spirits that temporarily inhabit physical bodies for several necessary incarnations to attain moral and intellectual improvement. It also asserts that spirits, through passive or active mediumship, may have beneficent or maleficent influence on the physical world. wikipedia