People seeking to become Roman Catholics:

participate in a formation program to help them understand and experience the teachings and practices of the Catholic Church. For Catholics who have been Baptized, Confirmed and made First Communion but then drifted from the faith, the way they return is through the Sacrament of Penance. Catholics who were Baptized but never received Confirmation and/or the Eucharist can participate in the process of continuing conversion. This process is completed with the reception of the sacraments of Confirmation and Holy Communion at the Easter Vigil or during the Easter Season.

[Rite of Christian Initiation of Adults, 2013, United States Conference of Catholic Bishops]