The Nativity Fast is a period of fasting observed by many Christians, particularly within the Eastern Orthodox and Eastern Catholic traditions. It begins on November 15 and lasts until December 24, leading up to the celebration of the Nativity of Christ, also known as Christmas. This fast is a time for spiritual preparation, reflection, and repentance. During the Nativity Fast, participants typically abstain from certain foods, such as meat and dairy, to focus on prayer and self-discipline. The fast encourages believers to deepen their faith and prepare their hearts for the joyous celebration of Christ's birth.