Description: ETFs are like index funds, that is, mutual funds designed to mirror the performance of various stock or bond market indexes. However, they also have important additional properties. Like an equity index fund, an ETF share represents an interest in the set of stocks constituting a particular market index. Unlike an index fund, however, ETF shares can be traded any time the market is open, just like stocks, and not like mutual funds that can only be traded as of the end of a day