Quoting Shari Hogan:" I'm not Catholic but I had a friend that is Catholic that was marrying a guy that had been married before ... [snip!] ... was more money and a pain to do but she wanted to get married in the Catholic church so they did it. I'm glad I'm not Catholic."
They're two different things. Annulments in the Catholic Church are for the Church alone. There is also such a thing as a legal annulment, which means that legally the marriage never existed and that is for things like proof of fraud, marrying someone underage, etc. The latter is done through the courts. I know it's confusing--one of them needs to call it something different, lol.