Christmas
The season to celebrate the Lord's birth, his manifestation to the world, and His baptism. The season begins Christmas eve and ends on the Baptism of the Lord, including the Epiphany of the Lord as well.
Advent (ad-venio in Latin or "to come to")
Beginning the Church's liturgical year, Advent is the season leading up to the celebration of Christmas. The Advent season is a time of preparation that directs our hearts and minds to Christ’s second coming at the end of time and also to the anniversary of the Lord’s birth on Christmas. Advent devotions remind us of the meaning of the season. Special Advent Devotions: the lighting of the Advent wreath; the Advent calendar helps remind us of the season with daily thoughts and activities; Advent prayers prepare us spiritually for the birth of Jesus Christ.
Advent & Christmas with Pope Benedict XVI
As a special spiritual gift this season, the United States Conference of Catholic Bishops is providing a downloadable book of scriptural reflections for Advent and Christmas featuring the words of Pope Benedict XVI from homilies, speeches and other addresses during his papacy. The 37-page document includes a scripture quote and a reflection from the Holy Father for every day of Advent, which begins on Sunday, November 28, 2010, through the 7th Day in the Octave of Christmas, December 31, 2010. "Advent & Christmas with Pope Benedict XVI" is a preview of the upcoming publication "A Year with Pope Benedict XVI," which will be available soon from USCCB.