Halloween is celebrated annually on October 31. It is part of the European traditions, originated from the ancient Celtic festival of Samhain, when people lighted bonfires and wore costumes to ward off ghosts. Pope Gregory III, in the 8th century, designated November 1st as a time to honour all saints. Eventually All Saints Day incorporated the traditions of Samhain and the evening before All Saints Day was known as All Hallows Eve and later became Halloween. Halloween evolved into a day of activities, including trick or treating in costumes from house to house. This tradition is celebrated in United States, Canada, Latin American countries, Europe and increasingly getting popular in Asia.