This document provides information about Halloween, including its origins, traditions, symbols, and expansion globally. Halloween originated from the Celtic celebration of Samhain, marking the end of the harvest season. Traditional Halloween colors of orange, black, purple and yellow also derive from Samhain. Common Halloween symbols include black cats, witches, pumpkins and bats. Making jack-o-lanterns and trick-or-treating are important Halloween traditions. While originally an American holiday, Halloween has expanded worldwide in popularity.