A Stocks and Shares ISA is a type of individual savings account that allows you to invest in a range of assets, such as stocks, bonds, and funds, while enjoying tax benefits. Any profits or income generated within the ISA are free from capital gains tax and income tax, making it an attractive option for long-term investors. You can contribute up to a certain limit each tax year, which is set by the government. The money you invest can grow over time, but it's important to remember that the value of investments can go up and down, meaning you could lose money.