There are 4 views of what happens at communion.
At one end, the Roman Catholic church believes that the bread and wine become the body and blood of Christ.
The Lutherans believe that the body and blood of Christ are in, around, and among the bread and wine.
Thus, both the Lutherans and the Catholics believe in a real, physical presence.
Calvinists believe in a real, but spiritual presence - the bread and wine remain bread and wine, but Christ is spiritually present in the elements.
At the other end of the spectrum from the Roman Catholics, the Anabaptists believe that the bread and wine are merely symbolic of Christ. They do not believe that there is a real presence in the elements.
Who in heart do you believe that you represent?