ETF's or Exchange Traded Funds have grown significantly in popularity over the last few years, in large part due to their low expenses and ease of buying and selling.
An exchange traded fund works similar to a mutual fund, in that it allows individual investors to buy into a larger pool of assets. The pool of assets may not change over time (passive ETF's) or may change day-to-day as the fund manager sees fit (active ETF's). Unlike traditional mutual funds, they are valued in real time, instead of being priced at the end of the day.
Any available ETF's can be purchased in all types of college accounts except Section 529 plans, which have a limited menu of investments that varies by state. However, there is at least one Section 529 plan that does include ETF's in their choice of investments.

