The Triumphal Entry refers to the event in the New Testament when Jesus entered Jerusalem riding a donkey. This event is celebrated on Palm Sunday and is significant in Christian tradition as it marks the beginning of Holy Week. Crowds welcomed Him by waving palm branches and shouting praises, recognizing Him as a king. This moment fulfilled the prophecy from the Old Testament, specifically in the book of Zechariah, which foretold a king coming in humility. The Triumphal Entry highlights the contrast between the expectations of a conquering king and the peaceful nature of Jesus' mission.