Pfingstsonntag, or Pentecost Sunday, is a Christian holiday celebrated on the 50th day after Easter Sunday. It commemorates the descent of the Holy Spirit upon the apostles, as described in the New Testament, marking the birth of the Christian Church. The day is observed with various religious services, feasts, and cultural traditions, particularly in Christian communities throughout Europe and beyond. In some regions, it is also associated with springtime festivals and local customs.