The Greek term epitimia refers to a special means used by the holy Church to bring healing and peace to the conscience of the penitent.
The word itself means “penalty” (2Co 2:6); under this name are prescribed to the penitent, as may be needed, particular exercises of piety serving to subdue sinful habit, which may include suspension from Holy Communion for a time. Like the canons themselves, the epitimia is medicine, not vengeance: its purpose is the healing of the soul.
What is confessed before the priest is entrusted to God: the priest may never reveal it, in any way or to anyone, even after the death of the penitent, and he who breaks the seal of Confession is deposed.