The Sacrament of the Eucharist
"Holy Eucharist is the sacrament in which Jesus Christ gives His Body and Blood - Himself - for us, so that we too may give ourselves to Him in love and be united with Him in Holy Communion. In this way, we are joined with the one Body of Christ, the Church. Christ instituted the Holy Eucharist on the evening before his death, "on the night when he was betrayed" (1 Cor 11:23), when he gathered the Apostles around him in the upper room in Jerusalem and celebrated the Last Supper with them."
(Catechism of the Catholic Church, 1322, 1324, 1409, 1413, 1323, 1337, 1340)
For more information on how to receive communion in the Catholic Church, join Fr. Dave Dwyer, CSP: