Differences between halloween and the day of the deads

Well, in the United States they usually celebrate halloween , in wich, boys and girls wear customes and get candies, but here in Mexico we got the tradition to put an ofrenda un wich we remember our relatives that have gone, in this ofrenda we also put food, candles, bread,water, etc, and it is celebrated in 1st and 2nd of November, many of the people go to cementeries.