An exchange traded fund (ETF) is an investment fund traded on stock exchanges, much like stocks. An ETF is hence a security that tracks an index, a commodity or a basket of assets just like an index fund, but trades like a stock on an exchange close to its net asset value over the course of the trading day. ETFs track an index, such as a stock index or bond index, and are attractive as investments because of their low costs, diversification and stock-like features. ETFs, globally, have developed into the most popular type of exchange traded product.