Halloween has its origins in the ancient Celtic festival of Samhain, where people would light bonfires and wear costumes to ward off ghosts. Over time, Halloween evolved into a day where people engage in activities like trick-or-treating and carving jack-o-lanterns. Trick-or-treating originated from the Middle Ages practice of dressing up and begging for food or money in exchange for prayers on Hallowmas. Modern Halloween is now one of the biggest celebrations after New Year's and the Super Bowl.