Halloween has its origins in ancient Celtic harvest festivals where the Celts believed the ghosts of the dead returned to Earth on October 31st. They would build bonfires and sacrifice crops to ward off these spirits. In the late 1800s, Irish immigrants introduced the tradition of neighborhood gatherings involving trick-or-treating to America. Today, Halloween is a platform for creativity where people enjoy wearing costumes, carving jack-o-lanterns, and watching horror films while getting scared.