text: This a question which needs to be answered with lots of knowlegde. Whether they actually exist has never been explained by science but then there are so many things which science is yet to explain or bring out proofs. We got to understand one basic fact the Science means those things which we can understand. For ghosts and paranormal phenomenon we can find thousands of people who can give testimony of their own experiences. So unless science proves ghosts are not there we can never say there are no ghosts. Its upto ourselves to believe or not.