The Triduum, also known as the Paschal Triduum or the Easter Triduum, is a three-day liturgical period in the Roman Catholic Church that commemorates the passion, death, and resurrection of Jesus Christ. It begins on the evening of Holy Thursday and concludes on the evening of Easter Sunday. The three days are:
Holy Thursday: This day commemorates the Last Supper of Jesus Christ with his apostles, during which he instituted the sacraments of Holy Eucharist and Holy Orders. The liturgical observances often include the washing of the feet ceremony, recalling Jesus' act of humility and service to his disciples.
Good Friday: This day commemorates the crucifixion and death of Jesus Christ on the cross. It is a day of solemn reflection, penance, and mourning. Liturgical services often include the Stations of the Cross, the veneration of the Cross, and the reading of the Passion narrative.
Holy Saturday: This day commemorates the time when Jesus' body lay in the tomb before his resurrection. It is a day of anticipation and waiting. The Easter Vigil Mass, held on Holy Saturday evening, is the climax of the Triduum. It includes the blessing of the Easter fire, the lighting of the Paschal candle, and the proclamation of the Easter Exultet. The vigil culminates in the celebration of Jesus Christ's resurrection from the dead.
The Triduum is considered the holiest time in the liturgical year, as it focuses on the central events of Christian faith: Jesus' sacrifice on the cross and his victory over death through his resurrection.