From the Shorter Catechism

Q. 96. What is the Lord’s Supper?

A. The Lord’s Supper is a Sacrament, wherein, by giving and receiving bread and wine, according to Christ’s appointment, his death is showed forth; and the worthy receivers are, not after a corporal and carnal manner, but by faith, made partakers of his body and blood, with all his benefits, to their spiritual nourishment and growth in grace. 1 Cor. 11:23-26; 1 Cor. 10:16.