October 31 is widely recognized as Halloween, a holiday celebrated in various countries. It originated from ancient Celtic festivals, particularly the festival of Samhain, which marked the end of the harvest season and the beginning of winter. People believed that on this night, the boundary between the living and the dead was blurred, allowing spirits to roam the earth. Today, Halloween is characterized by activities such as trick-or-treating, where children dress in costumes and collect candy from neighbors. Many people also enjoy decorating their homes with jack-o'-lanterns, spooky decorations, and hosting themed parties.