Confirmation is the special outpouring of the Holy Spirit. Its effects are to:
Confirmation imprints in the soul a character, a certain spiritual and indelible Sign, and so can only be received validly once. Confirmed persons are called to profess faith in Christ publicly, and to spread the Gospel message, in accord with the ability and circumstances of their life. The seven gifts of the Holy Spirit received in Confirmation are: wisdom, understanding, counsel, fortitude, knowledge, piety, and fear (awe) of the Lord.
Receiving this Sacrament, with Baptism and Communion, completes a Catholic's initiation into the one holy catholic and apostolic Church.