Catechism of the Catholic Church §1494 — excerpt
The confessor proposes the performance of certain acts of "satisfaction" or "penance" to be performed by the penitent in order to repair the harm caused by sin and to re-establish habits befitting a disciple of Christ.
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.