A jack-o'-lantern is a carved pumpkin, traditionally made for the Halloween season. People hollow out the pumpkin, removing its seeds and pulp, and then carve a face or design into its outer shell. Once the carving is complete, a candle or light is placed inside, illuminating the design and creating a spooky glow.
The practice of making jack-o'-lanterns originated from an Irish myth about a man named Stingy Jack. According to the legend, Jack tricked the devil and was doomed to wander the earth with only a carved turnip to light his way. When Irish immigrants came to America, they found that pumpkins were larger and easier to carve, leading to the modern tradition we enjoy today.