The Sacraments of Initiation are the initial sacraments by which persons become members of the Catholic Faith. Through these sacraments, one is first welcomed into the Catholic community; then strengthened through intensification of the presence of the Spirit; and nourished by the Body and Blood of our Lord. The ordinary time for these sacraments to be celebrated for adults is the Easter Vigil. The relationship between the sacrament of Baptism and Resurrection is one that is preached and prayed for throughout the whole of Lent. This "initiation process" is commonly known as the Rite of Christian Initiation for Adults (RCIA). This rite received a renewed focus through the efforts of Second Vatican Council. Children who are baptized receive only the first sacrament: Baptism. As they progress in their faith, they receive First Communion and Confirmation.
"Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you." (Mt 28:19-20)
While all Christians are initiated into the Church through the same essential process, not all Christians are called to live the same manner of commitment. Some are called to live in intimate union with another through the sacrament of marriage; some are called to live single lives; some are called to live a life of service that is directed at the ministry and mission of the Church. Both the commitment to marriage, (a commitment to human life) and the commitment to the mission of the Church, (a commitment to the life of the Church), are seen as fundamental calls to service and love. These Sacraments consist of Matrimony and Holy Orders.
In the Catholic Church we are brought into the community through the Sacraments of Initiation: Baptism, Confirmation and Eucharist. This is the beginning of our “Christian” journey and this beginning is a call to live a fuller, more human, sacramental life. In addition to the sacraments of Initiation, the Church offers two sacraments as a sign of the continuing healing power of Christ: Penance or Reconciliation and Anointing of the Sick (formerly called Extreme Unction.) Through these sacraments the Church is recognized as a healing, forgiving community in the name of the Lord Jesus. (Catholicism, Richard P. McBrien).