The Mass is a sacred banquet, like the Last Supper, in which bread and wine become Christ's Body and Blood, received in Holy Communion. Through the ministry of the ordained priest, the Holy Spirit makes present at Mass Christ's Paschal mystery, his dying and rising in which Christ is offered to the Father to give him adoration and praise to save us from our sins and bring us to divine life. 

(Unites States Catholic Catechism for Adults)