Are Ghosts Real?

Theories suggest that ghosts are real… they also suggest they are not real. We believe there is “something” out there, but we aren’t 100% convinced “what” yet. We have been on many investigations where there suggest possibilities of ghosts. Strangely enough, we have also encountered inhuman beings. Do you believe in (previously) human entities? How about inhuman entities? How do you know you have experienced or seen a “ghost”?