Ghosts are always interesting to think about.
I see ghost in folklore as simply the soul or spirit of a dead person or animal that can appear to the living.
Yeah that's pretty much what they are, but nobody knows if they are real or not.
Its all about belief,ghosts vary widely from an invisible presence to translucent or barely visible wispy shapes
Yeah true, I really don't believe in them though.
necromancy, or in spiritism as a "séance is a deliberate attempt to contact the spirit of a deceased person 
I've heard of all this before but I've never heard about it in such detail. Cool!
Interestingly,The belief in the existence of an afterlife, as well as manifestations of the spirits of the dead is widespread, dating back to animism or ancestor worship