Christmas is the Christian holiday that celebrates the birth of Jesus Christ. It is typically celebrated on December 25th, but the Christmas season can last longer than just that one day. In some countries, the Christmas season starts as early as November and can last all the way until January. Many people also celebrate the Twelve Days of Christmas, which is the period between Christmas Day and the Epiphany, which is also known as Three Kings' Day. This period traditionally lasts from December 25th to January 6th.