Halloween, also called All Hallows’ Eve, is a yearly holiday observed on October 31, the eve of the Western Christian feast of All Hallows (or All Saints). All Hallows' Eve is a Christianised feast influenced by western European harvest festivals, and pagan festivals of the dead, particularly the festival of Samhain among the Celts of ancient Britain and Ireland.
Halloween is observed primarily in regions of the Western world. Typical festive Halloween activities include trick-or-treating, attending costume parties, carving pumpkins into lanterns, lighting bonfires, playing pranks.