Short sellers are investors who bet that the price of a stock will decline. They borrow shares of a stock from a broker and sell them at the current market price. If the stock price drops, they can buy back the shares at a lower price, return them to the broker, and pocket the difference as profit. This strategy carries risks, as there is no limit to how high a stock's price can rise. If the price increases instead of falling, short sellers may face significant losses. Short selling is often viewed as a controversial practice in the stock market.