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Each year, on the last night of October, millions of children across the U.S dress-up in costume and take to the streets for a spooky dose of Trick or Treat fun.

The main event of modern US-style Halloween is trick-or-treating, in which children dress up in costume disguises and go door-to-door in their neighborhood, ringing each doorbell and yelling "trick or treat!" Although this resembles the older tradition of guising in Ireland and Scotland, ritual begging on Halloween does not appear in English-speaking America until the 20th century, and may have developed independently. The occupants of the house (who might themselves dress in a scary costume) will then hand out small candies, miniature chocolate bars, and sometimes even soda pop. Some American homes will use sound effects and fog machines to help set a spooky mood. Other house decoration themes (that are less scary) are used to entertain younger visitors. Children can often accumulate many treats on Halloween night, filling up entire pillow cases or shopping bags.

Halloween is a tradition celebrated on the night of October 31, most notably by children dressing in costumes and going door-to-door collecting sweets, fruit, and other treats. It is celebrated in parts of the Western world, most commonly in the United States, Canada, the UK, Ireland and Puerto Rico, and with increasing popularity in Australia and New Zealand, as well as the Philippines. In recent years, Halloween is also celebrated in parts of Western Europe, such as Belgium and France. Halloween originated as a Pagan festival among the Celts of Ireland and Great Britain with Irish, Scots, Welsh and other immigrants transporting versions of the tradition to North America in the 19th century. Most other Western countries have embraced Halloween as a part of American pop culture in the late 20th century.
The term Halloween, and its older spelling Hallowe'en, is shortened from All-hallow-even, as it is the evening before "All Hallows' Day"[1] (also known as "All Saints' Day"). The holiday was a day of religious festivities in various northern European Pagan traditions, until Popes Gregory III and Gregory IV moved the old Christian feast of All Saints Day from May 13 to November 1. In Ireland, the name was All Hallows' Eve (often shortened to Hallow Eve), and though seldom used today, it is still a well-accepted label. The festival is also known as Samhain or Oíche Shamhna to the Irish, Calan Gaeaf to the Welsh, Allantide to the Cornish and Hop-tu-Naa to the Manx. Halloween is also called Pooky Night in some parts of Ireland, presumably named after the púca, a mischievous spirit.
Many European cultural traditions hold that Halloween is one of the liminal times of the year when spirits can make contact with the physical world and when magic is most potent (e.g. Catalan mythology about witches, Irish tales of the Sídhe).