In the Sacrament of Confirmation, the baptized person is "sealed with the gift of the Holy Spirit" and is strengthened for service to the Body of Christ. Confirmation deepens our baptismal life that calls us to be witnesses of Jesus Christ in our families, neighborhoods, society, and the world. We receive the message of faith in a deeper and more intense manner, with great emphasis given to Jesus Christ, who asked the Father to give the Holy Spirit to the Church for building up the community in loving service.
~from the United States Catholic Catechism
Now when the apostles at Jerusalem heard that Samaria had received the word of God, they sent to them Peter and John, who came down and prayed for them that they might receive the Holy Spirit, for he had not yet fallen on any of them, but they had only been baptized in the name of the Lord Jesus. Then they laid their hands on them and they received the Holy Spirit.
For more information about Confirmation at Our Lady's Cathedral, click here.