december 25th - christmas (natal) is the religious holiday celebrated by christians to mark the birth of jesus christ. 

as with most early religious holidays there is much speculation as to the origin of the date, with many believing it corresponds with the southern solstice - today, it a national holiday in all christian countries and the biggest holiday celebrated in the world.

in rio de janeiro there are some very unique traditions, including the setting up of traditional nativity scenes in churches, stores and homes - the arrival of papai noel the gift bringer who is dressed in silk, because of the hot weather, and the exchange of gifts with a secret friend (amigo 'secreto' or 'oculto').