The Mass is the celebration of the Eucharist - the real presence of Jesus Christ in the form of bread and wine. The mass is divided into two parts: The Liturgy of the Word, and the Liturgy of the Eucharist.
In the Liturgy of the Word there are three readings from the Bible. The first is from the Old Testament. The second is from the New Testament, but is not one of the Gospels. The third reading is from one of the Gospels in the New testament: Mathew, Mark, Luke, or John.
In the Liturgy of the Eucharist Jesus is made present in the form of bread and wine. By the power of the Holy Spirit (the third person of the Blesses Trinity) the priest consecrates the bread and wine repeating the words of Jesus: "This is my body" and "this is my blood." The congregation then shares in eating the Eucharist, and literally(both physically and spiritually) becomes a part of the body of Christ, that is, the Church Jesus founded on Peter.
In the Liturgy of the Word there are three readings from the Bible. The first is from the Old Testament. The second is from the New Testament, but is not one of the Gospels. The third reading is from one of the Gospels in the New testament: Mathew, Mark, Luke, or John.
In the Liturgy of the Eucharist Jesus is made present in the form of bread and wine. By the power of the Holy Spirit (the third person of the Blesses Trinity) the priest consecrates the bread and wine repeating the words of Jesus: "This is my body" and "this is my blood." The congregation then shares in eating the Eucharist, and literally(both physically and spiritually) becomes a part of the body of Christ, that is, the Church Jesus founded on Peter.