So, ghost hunting is when people go looking for ghosts. A ghost is supposed to be the spirit of a dead person that didn't go to heaven or hell. Some people believe that ghosts are real, and they can be seen or even heard.
When people go ghost hunting, they bring some special equipment like cameras, microphones and thermal imagers to capture any signs of ghosts. They also often use EMF meters to detect electromagnetic fields which some people believe are present around ghosts.
People usually go looking for ghosts in places where they think there might be one - like old houses, cemeteries or even abandoned hospitals. Some people even believe that ghosts can appear in photos or videos, so ghost hunters often take a lot of pictures and videos while they search.
Some people say that they have had encounters with ghosts while they were on ghost hunts. But scientists usually do not consider ghost hunting to be a real scientific study because there is no evidence that ghosts actually exist. It's mostly a fun activity for people who believe in ghosts and want to try and find them.