Confession is one of the least understood of the sacraments of the Catholic Church. In reconciling us to God, it is a great source of grace, and Catholics are encouraged to take advantage of it often.
But it is also the subject of many common misunderstandings, both among non-Catholics and among Catholics themselves.
-- Confession Is a Sacrament.
The Sacrament of Penance, commonly called Confession, is one of the seven sacraments recognized by the Catholic Church. Catholics believe that all of the sacraments were instituted by Jesus Christ himself. In the case of Confession, that institution occurred on Easter Sunday, when Christ first appeared to the apostles after his Resurrection.