Stock investments refer to purchasing shares or stocks in a publicly traded company. This means that an individual or institution is buying ownership stakes in the company and, as such, becomes one of its shareholders. When a person invests in stocks, they are essentially betting on the success of the company whose stocks they have purchased. If the company performs well and sees an increase in its value, the investor may be able to sell their shares for a profit. However, if the company underperforms or goes bankrupt, the value of the stock may decrease, leading to potential losses for the investor. Overall, stock investments can provide opportunities for high returns but also come with risks and uncertainties.