A Catholic supplement to the
Bible. Despite the fact that many Catholics (and Christians for that matter) rarely read the
Bible, much less the catechism, BOTH books are incredibly important to understanding the Catholic faith.
It is analogous to reading the Tanakh, the Mishna, and the Talmud - which is what studious, ambitious, pious Jews do to develop their faith and be better Jews.
Similarly, reading and understanding the Bible AND the Catechism of the Catholic Church
will strengthen the faith of Catholics.