The document discusses the origins and history of Halloween. It traces the holiday's roots back to the ancient Celtic festival of Samhain, a harvest festival celebrated on October 31st to honor the dead. The Celts believed the souls of the dead roamed the streets on Samhain and left out gifts to appease spirits. This tradition evolved into modern trick-or-treating. Halloween was also influenced by the Christian holiday of All Saints' Day, which was designated on November 1st. While Halloween has pagan roots, it is now commonly celebrated as a fun time for wearing costumes and getting candy without focus on religious rituals.