A Roth IRA is an IRA that is not tax deductible when you make contributions. All growth and income is tax-free. You do not have to take Required Minimum Distributions (RMDs) when you reach age 70-1/2. You can remove your original contributions at any time, tax- and penalty-free. You can contribute $5,500 (or $6,500 if age 50+) per year to any IRA (for tax year 2017).
Roth IRAs are an important part of wealth planning, particularly for High Income Professionals (HIPs) because of the potential for tax-free growth. The earlier you begin, the better, especially since you are likely to be at a lower tax bracket when you are young.