From Facebook and Twitter to Amazon and the New York Times to banks and utility providers, it’s easy to see how our online accounts can add up. With so much of our lives these days being lived online, we’re also more at risk of a hacker accessing our personal information and using it to steal money, run up purchases, even use our medical coverage.

While certainly not the only options available, Individual Retirement Accounts (IRAs) and 401(k) accounts are two of the most common instruments used by American workers to save for their eventual retirement. But what’s the difference?