Catechism of the Catholic Church §2643 — excerpt
The Eucharist contains and expresses all forms of prayer: it is "the pure offering" of the whole Body of Christ to the glory of God's name and, according to the traditions of East and West, it is the "sacrifice of praise."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.