This document discusses the Catholic sacrament of Holy Eucharist. It describes Holy Eucharist as completing Christian initiation by allowing the faithful to participate in Christ's sacrifice of his body and blood. The Eucharist commemorates Christ's death and resurrection and is both the source and summit of ecclesial life as well as being bound up with and oriented to all other sacraments and ministries. The document then goes on to explain different names for the sacrament and parts of the Catholic mass including the liturgy of the word, consecration, and communion.