A share or a stock is a unit of ownership in a company. When you buy a share, you are essentially buying a small piece of the company. The more shares you own, the bigger your ownership stake in the company. Shares are bought and sold on stock exchanges. The price of a share is determined by supply and demand. If more people want to buy a share than sell it, the price will go up. If more people want to sell a share than buy it, the price will go down.
