The UNITED STATES CONFERENCE OF CATHOLIC
BISHOPS WEBSITE is a HUGE PDF copy of the printed
Catechism in book form, sold on Amazon and other places.

MR. LINDORFER'S WEBSITE is an unofficial copy of the
whole Catechism with links in the Table of Contents on the
Vatican Website, the HTML document itself, and other places,
as described at the text of the document below the picture.

This is a big document and may take a long time to load,
which is why there is a smaller page linked by Introduction
and Table of Contents (Sections), with section links to the
Vatican website and Subject Cross Reference Index (Topics
to topic and paragraph links in the HTML Catechism. You
can mouse or tap around to find the subject or paragraph
about what you're looking for without waiting for the long
time it takes to download the whole Catechism first.

The USCCB WEBSITE links to the first page of the United
States Conference of Catholic Bishops site. In the USCCB
WEBSITE TOPICS section, you can find information
and resources to learn more about the American Catholic
Church and what it teaches to help you grow in adult faith.

Clicking on here Will hopefully open an email page that
you can use to send me email if you want.