In the celebration of the Eucharist, bread and wine become the Body and Blood of Jesus Christ through the power of the Holy Spirit and the instrumentality of the priest. The whole Christ is truly present -- body, blood, soul, and divinity -- under the appearances of bread and wine, the glorified Christ who rose from the dead. This is what the Church means when she speaks of the "Real Presence" of Christ in the Eucharist. It is one one of the three sacraments of initiation.
Eucharist is one of the three sacraments of initiation into the Catholic faith, together with Baptism and Confirmation. Adults seeking preparation to make their First Communion are usually on a path to Becoming Catholic.