Halloween, one of the world's oldest holidays, is still celebrated today in several countries around the globe. The autumn rite is commemorated in the United Kingdom, although with a surprising and distinctive British twist. In Mexico, Latin America, and Spain, All Souls' Day, the third day of the three-day Hallowmas observance, is the most important part of the celebration for many people. In Ireland and Canada, Halloween, which was once a frightening and superstitious time of year, is celebrated much as it is in the United States, with trick-or-treating, costume parties, and fun for all ages.
The word itself, "Halloween," actually has its origins in the Catholic Church. It comes from a contracted corruption of All Hallows Eve. November 1, "All Hollows Day" (or "All Saints Day"), is a Catholic day of observance in honor of saints. But, in the 5th century BC, in Celtic Ireland, summer officially ended on October 31. The holiday was called Samhain (pronounced sow-in), which means "end of summer", the Celtic New year.