Why do people vary in calling it the Sacrament of Penance, Confession or Reconciliation?
The names emphasize different aspects of the sacrament. Penance refers to our repentance, sorrow and resolution to amend our life with God’s help. Confession refers to the act by which we tell our sins to the priest. Reconciliation refers to the goal of the celebration by which the sinner is reconciled to God and the Church (see CCC 1423-1424). The ritual for the sacrament is called the Rite of Penance, but is fitting to refer to it with any of these titles.