Ghosts have been speculated and feared for centuries. It's no wonder people bring them back to life in their creations. The idea of life after death is most likely inspired by our own fear of ceasing to exist. As to whether or not this is true... Who really knows? All we know is they make excellent subjects in creepypasta.
All the stories in the ghost category should be about a ghost. Please do not add stories such as the Rake and the Smiling Man, as these are entities and beings, and should be placed in those categories.