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Halloween costumes are one of the most fun parts of the celebration. People dress up as anything from spooky creatures like ghosts and witches to popular characters from movies or TV. In the United States, the tradition of wearing costumes comes from old practices where people would disguise themselves to avoid being recognized by ghosts.

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Halloween started as a Celtic festival called Samhain over

2,000 years ago in what is now Ireland and Scotland. It marked the end of harvest

season and the beginning of winter, a time when it was believed the boundary between

the living and the dead was thin. People lit bonfires and wore costumes to ward off

spirits. When Christianity spread, the holiday was combined with All Saints&#39; Day and

became known as Halloween.

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Candy is the main treat on Halloween, especially in the U.S., where children go "trick-or-treating" from house to house asking for sweets. Pumpkins are also popular and are used to make jack-o'-lanterns. In Ireland, a traditional Halloween food is "barmbrack," a fruitcake that sometimes has small items hidden inside, each with a special meaning.