Okay kiddo, so you know how some people called priests or pastors help us learn about God and lead us in worship? Well, just like how your teacher at school has a special title, like "Mrs." or "Mr.," priests and pastors have special titles too!
The title that a priest or pastor has depends on how important they are in the church. The most important person in the Catholic Church is the pope, and he has a really fancy title - "His Holiness Pope Francis." Other important people in the Catholic Church, like cardinals and bishops, have titles too, like "His Eminence Cardinal John Smith" or "Most Reverend Bishop Sarah Johnson."
In other churches, like the Anglican Church, the titles are a little different. The most important person in the Anglican Church is the Archbishop of Canterbury. He's called "The Most Reverend and Right Honourable Justin Welby." Other important people in the Anglican Church, like bishops, have titles too, like "The Right Reverend Jill Brown."
These titles are important because they show the respect that we have for these people, and they can tell us how important someone is in the church. When we talk to someone with a title like "His Holiness" or "Most Reverend," we need to remember to be polite and respectful, just like we would when talking to our teacher or our parents!