A convertible bond is a hybrid security that can be converted into shares of the issuing company's equity at a predetermined price. It gives the bondholder the option to exchange the bond for a set number of shares. Convertible bonds offer upside potential if the stock price rises through conversion while also providing downside protection through interest payments and repayment of principal. They are attractive to companies with high growth potential but also high risk, as the conversion feature allows the company to strengthen its equity base if its stock price appreciates.