What Are Exchange Traded Funds?
An ETF is an open ended fund which trades on the stock exchange (open-ended means that the fund can issue or redeem shares at any time). Most of the ETFs I've looked at are designed to track the price of a particular index. They are similar to shares in that you can buy and sell them through your normal stock broker. The only cost you need to pay is brokerage. Another way in which they are like shares is that they pay distributions in a similar way to which shares pay dividends.