Palm Sunday today starts Holy Week, the most solemn yet joyous time on the Christian calendar. Palm Sunday takes its name from an impromptu welcome given Jesus as he entered Jerusalem on the last week before his crucifixion.
According to the Gospel accounts, Jesus came into Jerusalem on a donkey, with people paving the street before him with coats and palm fronds. That week he preached in the Temple and celebrated Passover with his disciples. Their observance of the Seder, the ritual meal of Passover, has become known in churches as the Last Supper.
Churches commonly celebrate Palm Sunday with special musical programs and Easter pageants. They often pass out palm leaves, sometimes tied into the shape of a cross. In Catholic and some Episcopal churches, extra palm leaves are burned and the ashes saved for Ash Wednesday the following year.
Holy Week ends with Maundy Thursday, commemorating the birth of the Holy Communion ritual; Good Friday, mourning Jesus' death; and Easter Sunday, celebrating his Resurrection.
— James D. Davis