Eucharist is one of the three Sacraments of Initiation. It is also called Holy Communion. Here it is understood as the Eucharist received where as the Mass is the Eucharist celebrated. We receive the Body and Blood of Jesus Christ under the appearance of bread and wine. As we eat His Body and drink His Blood we become what we eat, more and more like Christ. Sharing in the Eucharist is a sign of our unity as Catholic Christians.
Unlike the other Sacraments of Initiation which we can only receive once in a lifetime, we may receive Eucharist as often as once a day. We are encouraged to receive Communion regularly so that we can continually be renewed and nourished spiritually. Just as we feed our bodies to stay healthy so we should feed our spirits.