The Catholic Church teaches that once consecrated in the Eucharist, the elements cease to be bread and wine and actually become the body and blood of Christ, each of which is accompanied by the other and by Christ's soul and divinity.
The Eucharist is another name for Holy Communion. The term comes from the Greek by way of Latin, and it means "thanksgiving." It is used in three ways: first, to refer to the Real Presence of Christ; second, to refer to Christ's continuing action as High Priest (He "gave thanks" at the Last Supper, which began the consecration of the bread and wine); and third, to refer to the Sacrament of Holy Communion itself.
Many people refer to the Mass as "the Eucharist," but such a use is incorrect. The Mass is made up of two parts: the Liturgy of the Word and the Liturgy of the Eucharist. The Mass is more than simply the Sacrament of Holy Communion.
An extraordinary minister of Holy Communion in the Catholic Church is, under the Code of Canon Law, "an acolyte, or another of Christ's faithful deputed", in certain circumstances, to distribute Holy Communion.