Stocks and shares ISAs are different from cash ISAs - which are just tax-free savings accounts. A stocks and shares ISA lets you put money into a range of investments, such as unit trusts, open-ended investment companies (OEICs - similar to unit trusts) and investment trusts, as well as government and corporate bonds. You can also invest directly in shares with the help of a stockbroker. If you're going to invest in the stock market, be prepared to take some risk - the value of your investments may go down as well as up.