MashGet

Confession from WikiPedia:

The confession of one's sins is a religious practice important to many faiths, e.g., Roman Catholicism and Eastern Orthodoxy.

In Christian faith and practice (James 5:16), confession is similar to a criminal confession -- an admission of one's guilt. The practice is conducted between a confessor and a priest, often within a confessional box or booth. Confession of one's sins, or at least of one's sinfulness, is seen by most churches as a pre-requisite for becoming a Christian.

In Catholic teaching, the sacrament of Penance (commonly called confession but more recently referred to as Reconciliation, or more fully the Sacrament of Reconciliation) is the method used by the Church by which individual men and women may confess sins committed after baptism and have them absolved by a priest. This sacrament is known by many names, including penance, reconciliation and confession (Catechism of the Catholic Church, Sections 1423-1442). While official Church publications always refer to the sacrament as "Penance", "Reconciliation" or "Penance and Reconciliation", many laypeople continue to use the term "confession" in reference to the sacrament.

Read more on WikiPedia