A normal demand curve slopes downwards from left to right. This means that as the price of a product decreases, the quantity demanded of that product increases. Conversely, as the price of a product increases, the quantity demanded of that product decreases. This is because people generally want to buy more of a product when it is cheaper, and less of a product when it is more expensive. Therefore, the demand curve shows the relationship between the price of a product and the quantity of that product that consumers are willing and able to buy at each price level.