In Irish folklore, a banshee is a Celtic mythological being, an attendant fairy that followed old, established families, and wails outside the door when one of them is meant to pass away. this spirit or ghost called banshee, is also known as the harbinger of death, because she was a wailing fairy foretelling doom. the banshee scream was meant to warn people about an upcoming death. the legend around the banshee is well-known in urban legend and storytelling.