Global and International Funds Investors seeking world investments can choose between global and international funds. What's the difference? Related Content What Is a Roth 401(k)? Roth 401(k) plans combine features of traditional 401(k) plans with those of a Roth IRA. Tuning Your Social Security Benefit When should you take your Social Security benefit? A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.