ETF is Exchange Traded Fund... like a basket of stocks... or like trading a mutual fund real-time as though it were a stock.
Sorry, I could not resist! You still need to "Borrow" ETF's even thought they are inherently "SEXY">>> Short Exempt. Just a tidbit of usless info. http://www.smartmoney.com/etf/etfTickerTracker/?sortCol=volume
Sorry, don't mean to be critical but you have posted 2068 times on this site and you don't know what an ETF is? Good Lord.