"Individual and complete confession, is the ordinary means of reconciliation with God and with the Church." (C. 960)
Catholics will call this sacrament "Confession." However, this word alone does not really capture the significance of this beautiful sacrament. It is one of healing, and confession is a part of this, but not the whole of it.
When we commit sins we wound our relationships with God, with others and the whole of the community. So we need to be reconciled. The priest, in the name of the community and of God hears the confession of sins, will administer a penance which is to effect a healing, and then will give the words of absolution.
This makes all people nervous, but in the end, it is a relief to be released of those wounds. Of course, the intent is that we are no longer going to commit those sins. So it is not intended for us to sin and confess, then keep on repeating. It is to evoke a change in our behavior.
When a person celebrates the Sacrament of Reconciliation all that they tell the priest is held confidential through the Seal of the Confession. The priest may not speak of what he has heard, nor can he be coerced to speak of what he has heard.
Catholics are to regularly celebrate this Sacrament, especially when they are conscious of committing a grave (mortal) sin.