Catechism of the Catholic Church §1232 — excerpt
The second Vatican Council restored for the Latin Church "the catechumenate for adults, comprising several distinct steps." The rites for these stages are to be found in the Rite of Christian Initiation of Adults (RCIA).
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: SC 64 · RCIA (1972) · SC 65 · SC 37-40