Christmas is a very special day to about 2 billion people across the world but did you know that the earliest Christians did not think of it as the commemoration of the real day of Jesus' birth? That's right. And the name of Christmas is itself a clue to the original purpose of this special day, the "holiest" day of the year. To understand what Christmas was originally supposed to be we have to take a little trip through history with a side journey into etymology.