Ghosting is when someone suddenly stops talking to you and disappears, like they became a ghost. It's a mistake to do this because it can hurt the feelings of the person you're talking to. It's like if you were playing with a friend and then they suddenly got up and left without saying anything. It can make you feel sad, confused, and lonely. It's always better to talk things out and be honest with people if you don't want to talk to them anymore.