One of the three main missions of the LDS Church is to redeem the dead. The teachings of Mormonism state that non-Mormons will enter spirit prison after physical death and wait for Judgment Day. Those in spirit prison have the opportunity to convert to Mormonism, but they cannot eternally progress unless they are baptized. Such spirits must receive baptism vicariously through a living person on earth since they do not have a body that can be baptized. The work of baptizing for the dead (or redeeming the dead) happens only in the temple. Faithful Mormons will carry out this important temple work as a means to further their divine potential. This is the primary motivation behind the extensive genealogical research carried out by the LDS Church. Mormons will refer to this activity as doing family history work.