Hopefully I have given you enough tease to get you curious about the tax advantages of a retirement savings account. I recommend you peruse these introductory posts to gain a basic understanding of retirement saving before reading this number-heavy post.
Like a 401(k), an IRA is a retirement savings account. You put money in it, and use that money to invest. But unlike a 401(k), an IRA does not have an employment requirement. IRA stands for Individual Retirement Account; anyone, even if he is not employed, can contribute to an IRA unless his income is too high. This works perfectly for freelancers such as my friends that are dancers and do not work for any particular company.