What is correct: interracial marriage or biracial marriage?

When two people who are different races get married, is that an interracial marriage or a biracial marriage? I say interracial, but I see biracial and multiracial. Is it all synonymous and understood the same way?

If one of the people is Hispanic would you use one of the terms I mentioned above, even if they are all the same race?

I am writing for a presentation and I want to make sure I get the terminology correct.

Thanks!