What is meant by Holy Communion?
Holy Communion is a sacrament in which the faithful receive Jesus as the Bread of life, as spiritual food. The Mass is both a sacrifice and a sacred banquet; Jesus is offered to the Father, and He is received as the nourishing strength of His people. Communion unites us more closely with Jesus Himself, and unites us also with all of our brothers and sisters in Christ.
Sometimes Catholics receive Communion under the form of bread alone; sometimes they receive it under the forms of both bread and wine. In either case, one receives the whole Christ.