An exchange traded fund, or ETF, is a basket of securities, stocks, bonds, or commodities that trade on an exchange, just like a stock. They combine the trading flexibility of a stock with the diversification and low costs of a mutual fund. The first exchange-traded fund was launched in 1993. Since then they have become as much of a revolutionary financial instrument as mutual funds. The ETF universe has been growing steadily over the last 15 years, with the number of funds increasing more than ten-fold. But there are perils to this very popular investment vehicle. This book will outline the hazards that every small time investor should know about.