Pentecost is a Christian holiday that commemorates the day the Holy Spirit descended upon the apostles and other followers of Jesus Christ. This event is described in the Book of Acts, chapter 2 in the New Testament. It occurred 50 days after Easter (which celebrates the resurrection of Jesus) and 10 days after the Ascension (when Jesus is said to have ascended into heaven).

Key Points About Pentecost:

• Name origin: The word "Pentecost" comes from the Greek Pentēkostē, meaning "fiftieth."

• Jewish roots: Pentecost originally referred to the Jewish Feast of Weeks (Shavuot), which celebrates the giving of the Torah at Mount Sinai. The Christian Pentecost happened during this Jewish festival.

• Significance for Christians: It is often called the "birthday of the Church" because it's considered the beginning of the Christian mission to the world, as the apostles began preaching publicly with boldness.

• Symbolism: The Holy Spirit is traditionally represented by tongues of fire, a mighty wind, or a dove.

• Liturgical colour: Red, symbolizing the fire of the Holy Spirit.