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!
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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 in pre-literate cultures. Certain religious practices—funeral rites, exorcisms, and some practices of spiritualism and ritual magic—are specifically designed to rest the spirits of the dead. Ghosts are generally described as solitary, human-like essences, though stories of ghostly armies and the ghosts of animals rather than humans have also been recounted. They are
Ghost
In folklore, a ghost (sometimes known as an apparition, haunt, phantom, poltergeist, shade, specter or spectre, spirit, spook, and wraith) is the soul or spirit of a dead person or animal that can appear to the living. In ghostlore, descriptions of ghosts vary widely from an invisible presence to translucent or barely visible wispy shapes, to realistic, lifelike forms. The deliberate attempt to contact the spirit of a deceased person is known as necromancy, or in spiritism as a "séance