Debentures are loan certificates issued by a company to raise long-term funds from the public without increasing share capital. They mature after a fixed period, at which point the company must repay the principal amount. Debentures offer a fixed rate of interest but do not provide control rights or claims on company assets/income to debenture holders like shareholders. While debentures provide a stable source of low-cost financing, over-reliance on them increases financial risk for companies, especially during times of economic depression when profit declines make interest payments a burden.