The sacrament of confirmation completes the sacrament of baptism. In baptism, we receive the Holy Spirit. In confirmation, this relationship is sealed and strengthened. As a sacrament of initiation, confirmation is closely related to baptism, but in practice the two sacraments are often separated by many years.
The Church teaches...
Confirmation is a true sacrament instituted by Christ and different from baptism. It is administered by laying-on of hands and anointing with chrism accompanied by prayer. The chrism is blessed by the bishop and the bishop administers the sacrament. All baptized persons can and should be confirmed. The effect of the sacrament of confirmation is to give strength in faith and for the confession of faith and to impress an indelible character. Like baptism, it marks us for Christ.