Mediumship

Mediumship is the claimed ability of a person (the medium) to experience contact with spirits of the dead, angels, demons or other immaterial entities. A medium is defined by the Oxford English Dictionary as "a person believed to be in contact with the spirits of the dead and to communicate between the living and the dead".

The role of the medium is to facilitate communication with spirits who have messages to share with non-mediums. Mediums claim to be able to listen to, relay messages from, and relate conversations with spirit, to go into a trance (it is not necessary to go into a trance, it all depends on the medium's control and knowledge) and speak without knowledge of what is being said, to allow a spirit to control their body and speak through it, perhaps using a writing instrument (as in automatic writing or drawing).

Source: Wikipedia