A buyback, or share repurchase, is when a company buys back its own shares from the stock market. Companies do this to increase the value of remaining shares, as there will be fewer shares available. This can make each share more valuable and potentially raise the stock price. Buybacks can also show that a company is confident in its future and wants to use extra cash effectively. Shareholders can choose to sell their shares back to the company, often at a higher price. Overall, buybacks can benefit shareholders but can also spark debate about how companies should use their cash.