Halloween is a tradition celebrated on the night of October 31, most notably by children dressing in costumes and going "trick or treat" door-to-door collecting sweets. It is celebrated in parts of the Western world, though most commonly in the United States, Canada, the UK, Ireland, Puerto Rico, and with increasing popularity in Australia and New Zealand. Halloween originated among the Celts in Ireland, Britain and France as a harvest festival, Samhain.  Several immigrant groups brought versions of the traditions to North America in the 19th century. Most other Western countries have embraced Halloween as a part of American pop culture.

The term "Halloween" is shortened from All-hallow-even, as it is the evening before "All Hallows' Day" (also known as "All Saints' Day").

Halloween is often associated with the occult. Many European cultural traditions hold that Halloween is one of the times of the year when the spiritual world can make contact with the physical world and when magic is most potent.
 

pumpkin
jack-o-lantern
black cat
skeleton
ghost
goblin
witch
scarecrow
haunted house
bat