Halloween is a holiday celebrated on October 31st that originated from ancient Celtic harvest festivals. It is commonly celebrated in Western countries like the United States through activities like trick-or-treating, wearing costumes, and carving jack-o-lanterns from pumpkins. Jack-o-lanterns are carved pumpkins named after a man from Irish folklore whose soul was condemned to wander at night with only a pumpkin lantern to light his way. Common Halloween decorations and symbols include pumpkins, black cats, ghosts, and witches.