I have been going to a Catholic School since preschool, I think I can answer your question.
The Church is basically like a government, commonly referred to as the Magisterium. I can get into detail, but I'm just going to explain the titles, or "ranks".
Pope - President
The pope is like the Barrack of the Church. He makes new laws, vetoes, ratifies, etc. He can be Pope for as long as he wants, even until he dies. He lives in Rome in Vatican City, like how the President has to live in D.C. You still with me?
These guys do what the pope doesn't have time to, like dealing with the bishops, voting for new popes, and so on.
Bishops - Senator/ House of Representatives
There are a few titles given to certain men. Arch Bishops control the diocese, lets say for example, the Arch Diocese of New York. We have an arch bishop in charge of us, kinda like senators. They ordain priests and perform Confirmation. Another title is Cardinal.
Then there's pastors, priest, brothers, and so on.
Here's a link to Wikipedia about the hierarchy of the Roman Catholic Church. It can explain this system much greater than I. And plus, it took me about thirty minutes to just quickly explain a few titles. Sorry.