Jack-o'-lanterns are usually lit from within by a small candle or tea light. The flickering flame illuminates the carved features, casting eerie shadows and creating a spooky ambiance. The use of candles in jack-o'-lanterns dates back to ancient times when turnips and later pumpkins were carved to ward off evil spirits. The tradition evolved over time, and now candles are commonly placed inside the hollowed-out pumpkins to bring them to life. The soft, warm glow of the candle adds an element of mystery and enchantment to the jack-o'-lantern, making it a quintessential symbol of Halloween and creating a captivating sight for trick-or-treaters and visitors.