Ghost simply means a dead soul or ghost. Belief in ghosts dates back to ancient times. Ghosts are mentioned in ancient folklore of the world. And many nations of the world believe in demons. According to them, as soon as the soul leaves the body of the animal, it becomes lifeless. Some souls come back even after leaving the body of the animal. And this returning soul is a ghost. He does not have any physical form. He remains vague. But his behavior is like a normal living body. He cannot be seen