Pentecost, also known as Whit Sunday, is one of the most significant feast days in the Christian calendar. It commemorates the descent of the Holy Spirit upon the Apostles and other followers of Jesus. This event is often referred to as the birth of the Christian Church because it marks the beginning of the Apostles' public ministry to spread the Gospel.

Orthodox Pentecost is one of the Great Feasts of the Eastern Orthodox Church. It commemorates the descent of the Holy Spirit upon the Apostles, marking the fulfillment of Christ's promise to send the Spirit to guide and empower the Church. Orthodox Pentecost is rich in theological significance, liturgical traditions, and cultural customs.