Christmas in the Catholic Church is a significant celebration that commemorates the birth of Jesus Christ. It is observed on December 25th and marks the beginning of Christmas season, which lasts until the Feast of the Baptism of the Lord. This holy day is characterized by special Masses, carols, and the display of the nativity, reflecting the joy and hope that Christ's birth brings to the world. Catholics also emphasize the themes of love, peace, and goodwill during this festive time.