Christmas is celebrated on December 25th, but the holiday season begins much earlier, with the start of Advent on the fourth Sunday before Christmas Day. Advent is a time of preparation and reflection, leading up to the celebration of the birth of Jesus Christ. Many people observe Advent by lighting an Advent candle or wreath, which are lit on each Sunday of the Advent season. Advent also involves prayer, meditation, and reflection, as well as acts of kindness and charity.