Cash ISAs help you save without paying any income tax on the interest you earn. They are as safe as any other savings account.
Stocks and shares ISAs are a suitable alternative if you're looking to invest for between 5 to 10 years, or longer. They allow you to hold investments without paying Capital Gains Tax on any potential profits. Any income you receive from your investments is also free from UK Income Tax. You must remember that with stock and shares ISAs, the value of your investment can go down as well as up and you may get back less than you originally invested.