39 This presence is called "real" not to exclude the idea that the others are "real" too, but rather to indicate presence par excellence, because it is substantial and through it Christ becomes present whole and entire, God and man. (41) And so it would be wrong for anyone to try to explain this manner of presence by dreaming up a so-called "pneumatic" nature of the glorious body of Christ that would be present everywhere; or for anyone to limit it to symbolism, as if this most sacred Sacrament were to consist in nothing more than an efficacious sign "of the spiritual presence of Christ and of His intimate union with the faithful, the members of His Mystical Body." (42)
Source: Mysterium Fidei (Vatican.va)