Okay, imagine you are at a party with lots of friends. Some of your friends have different ideas about how to have fun and how to do things. Well, this is kind of like Catholicism and Freemasonry.
Catholicism is a religion, which means it's a way to believe in God and worship Him. It has a set of rules and practices that people who follow it try to live by. These rules and practices are based on the Bible and the teachings of Jesus.
Freemasonry, on the other hand, is a group of people who come together to talk about good things that they want to do in the world, like helping others and being kind. They also have their own set of rules and practices, but they're not based on any particular religion.
Now, the Catholic Church doesn't like Freemasonry very much because they think some of their ideas and practices go against what the Church believes in. In fact, the Catholic Church has said that people who are Catholic cannot belong to the Freemasons.
On the other hand, some people who are Freemasons say that they are also Catholic, and that they don't think there's anything wrong with being both. But the Church doesn't agree with them, and they've said that if a Catholic belongs to the Freemasons, they are not allowed to receive some of the important sacraments of the Church, like Communion.
So, imagine if some of your friends started doing things that you didn't agree with, and you decided you didn't want to be friends with them anymore. That's kind of what's going on between Catholicism and Freemasonry. They used to be friends, but now they're not so much.