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Confession: when I graduated from college, I did not know the first thing about a Roth IRA, much less how it differed from a traditional IRA or a 401(k). It took countless phone calls to my parents and a few "Roth vs. Traditional IRA" Google searches for me to finally get it down. In fact, a Roth IRA may be one of the most baffling personal finance concepts for millennials. And this is a serious problem because a Roth IRA is actually a helpful, tax-efficient way to save for retirement. Especially for young people!