For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread, and when he had given thanks, he broke it, and said, “This is my body, which is for you. Do this in remembrance of me.” In the same way also he took the cup, after supper, saying, “This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me.” For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until he comes. — 1 Corinthians 11:23-26 (ESV)
The Lord’s Supper, or the Sacrament of the Altar, is the true body and blood of the Lord Jesus Christ, under bread and wine, instituted by Christ himself, for Christians to eat and drink. This is more than a remembrance meal; it is a holy meal, an engagement with God Himself. It is for the forgiveness of my sins and also for the strengthening of my life. And as we commune together, we are all part of the same body, His body. So as you commune, remember and enjoy the fellowship you have not only with Christ, but with all believers.