What is a Jack-o'-Lantern?

Jack-o'-Lantern is a lantern carried by children, especially after nightfall Hallowe'en. It is made from a pumpkin by cutting holes to represent a mouth, nose, and eyes. A candle placed within gives a peculiarly weird light. The name is also applied to the Will-o'-the-wisp,or ignis fatuus.

Jack-o'-Lantern Pumpkin