An IRA is not an investment in and of itself. Think of an IRA as a container that holds stocks, bonds, mutual funds, property or gold bars - anything that is considered an investment. The IRA "container" defines your tax benefit, with different types of IRAs having different tax benefits and different rules for contributions and disbursements. The investments in the IRA define the kind of returns you get on your contributions.
The two most popular IRAs are Traditional IRAs and Roth IRAs. Traditional IRAs are covered in this article.
Tax codes occasionally change so check with the financial institution you will open an IRA with, an accountant, IRS Publication 590 or contact the Internal Revenue Service for the most recent rules governing Roth IRAs before investing in one.
How is a Roth IRA Different from a Traditional IRA?