Liturgy is the Church’s official public and communal worship. It is really something much deeper than mere ritualism or ceremony. It is entering into the mystery of our redemption.
While the celebration of the Eucharist is the Church’s principal act of worship, the Liturgy also includes the celebration of the six additional sacraments, the official daily prayer of the Church (the Liturgy of the Hours), and liturgies for special celebrations. As the Church’s official worship, each of these liturgies has at its heart the celebration of the “Mystery of our Faith” – that is, the sacred passion, death and resurrection of Our Lord Jesus Christ. This mystery, known as the Paschal Mystery, is the continuing work of our redemption by Christ and through his Church. [From: Archdiocese of Philadelphia]