Pumpkins are also an iconic symbol of Halloween. Pumpkins are orange, so orange has become a traditional Halloween color. Carving a pumpkin lantern from a pumpkin is also a Halloween tradition, and its history can also be traced back to Ireland.
Legend has it that a man named Jack was very stingy, so he could not enter heaven after death, and because he made fun of the devil and could not enter hell, he could only wander around with the lantern until the day of Judgment Day. As a result, Jack and the jack-o-lantern became the symbol of the cursed wandering soul. In order to scare away these wandering souls on Halloween, people carved the scary faces with turnips, beets or potatoes to represent Jack holding the lantern. This is the origin of Jack-o'-lantern. After the Irish moved to the United States, they started carving with pumpkins, because pumpkins were more abundant than turnips in the United States in the fall.
Now, if people hang pumpkin lights on the windows on Halloween night, it means that those wearing Halloween costumes can knock on the door and make fun of candy.