The Rite of Christian Initiation of Adults or R.C.I.A. is the normal way an adult becomes a Catholic.
The highlight of the R.C.I.A. is at the Easter Vigil when the catechumen (one who is not baptized) or the candidate (one who was baptized already in a Protestant community) receives the Sacraments of Initiation.
Catechumens receive Baptism, Confirmation and Holy Communion. Candidates make a profession of faith and receive Confirmation and Holy Communion.
For more information about the R.C.I.A. click here.