The blessed Eucharist is the most venerable sacrament in which Christ the Lord becomes present, and is offered and received, and by which the Church continually lives and grows. The Eucharistic Sacrifice, the memorial of the death and resurrection of the Lord, is the summit and source of all worship and Christian life.
“I am the bread of life. He who comes to me will never go hungry; he who believes in me will never thirst” (John 6:35)
It is during Divine Liturgy that the wheat bread and grape wine are transubstantiated by the priest into the flesh and blood of Christ. Christ is really present in the Holy Eucharist. The sacrament effects union with Christ; it is nourishment for the soul, gives increase in grace and remits venial sin and punishment.
Please refer to Divine Liturgy times here.