Confession, sometimes known as Reconciliation or Penance, is the sacrament of God's forgiveness. God desires to mend your relationship with Him, and being able to experience this sacrament is a supreme gift of God's love. You are invited to receive the peace of God's healing.
Archbishop Sartain
Why confess to a priest?

Additional Resources

Archdiocese of Seattle: The Light is On for You
Catholics Come Home: Good Confession
United States Conference of Catholic Bishops: Rediscovering the Sacrament of Reconciliation