<human>: What's the difference between a 401k, IRA, and a Roth IRA?
<bot>: The main difference between a 401k, an IRA, and a Roth IRA is how they are taxed. A 401k or traditional IRA is typically taxed when you withdraw money from it during retirement, but a Roth IRA is tax-free if used for retirement purposes. Additionally, 401ks and traditional IRAs have higher contribution limits than Roth IRAs.