The Catechism of the Catholic Church says about this sacrament: “By the Sacrament of Confirmation [the baptized] are more perfectly bound to the Church and enriched with a special strength of the Holy Spirit. Hence they are, as true witnesses of Christ, more strictly obliged to spread and defend the faith by word and deed” (#1285).
The sacrament of Baptism incorporates one into the Body of Christ and hence makes one a member of Christ’s Church. What the Catechism means when it says that the baptized “are more perfectly bound to the Church” is that Confirmation, in effect, completes the process begun in Baptism, and fulfills what Christian Initiation is all about. This is why the traditional order of the sacraments in the Church, from our earliest evidence, is generally: Baptism, then Confirmation, and then Holy Eucharist.