Halloween or Hallowe'en (a contraction of "All Hallows' Evening"), also known as All Hallows' Eve, is a yearly celebration observed in a number of countries on October 31, the eve of the Western Christian feast of All Hallows (or All Saints)
Trick-or-treating is a customary celebration for children on Halloween. Children go in costume from house to house, asking for treats such as candy (sweets) or sometimes money, with the question, "Trick or treat?" The word "trick" refers to a (mostly idle) "threat" to perform mischief on the homeowners or their property if no treat is given.
Development of artifacts and symbols associated with Halloween formed over time. The turnip has traditionally been used in Ireland and Scotland at Halloween, but immigrants to North America used the native pumpkin, which is both much softer and much larger – making it easier to carve than a turnip. It is called jack-o'-lantern.