Spiritism, as defined by its founder, Allan Kardec, is “a science dedicated to the relationship between incorporeal beings and human beings.” Kardec was a French educator whose real name was Hippolyte Leon Denizard Rivail. Kardec codified the Kardecist Spiritualism Doctrine, the aim of which was to study spirits—their origin, nature, destiny, and relation to the corporeal world. Spiritism became a popular movement and is now represented in 35 countries. Kardec also wrote The Spirits’ Book in an attempt to show how Spiritism differs from spiritualism.