The Roman Catechism is a book that tells us how to be good Catholics. It was written a long, long time ago in a city called Rome by some very smart people who were called bishops and cardinals.
In this book, there are lots of questions and answers that teach us about God, Jesus, and the Catholic Church. Some of the things we learn are what we need to do to be good Catholics, how to pray, and what we should believe about God and Jesus.
The Roman Catechism is like a big, special guide that helps us understand what we need to do to be close to God and make Him happy. So, if you ever have any questions about being a good Catholic, you can look in the Roman Catechism and find the answers!