A jack-o'-lantern (or jack o'lantern) is a carved pumpkin, turnip, or other root vegetable lantern, associated with the holiday of Halloween and named after the phenomenon of a strange light flickering over peat bogs, called will-o'-the-wisp or jack-o'-lantern. Its name is also tied to the Irish legend of Stingy Jack, a drunkard who bargains with Satan and is doomed to roam the Earth with only a hollowed turnip to light his way.
Jack-o'-lantern's are a yearly Halloween tradition that came to America from Irish immigrants.
In a jack-o'-lantern, the top of the pumpkin or turnip is cut off to form a lid, the inside flesh is scooped out, and an image — usually a monstrous or comical face – is carved out of the rind to expose the hollow interior. To create the lantern effect, a light source is placed within before the lid is closed. The light source is traditionally a flame such as a candle or tea light, but artificial jack-'o-lanterns with electric lights are also marketed. It is common to see jack-o'-lanterns on doorsteps and otherwise used as decorations prior to and on Halloween.