Which type of bond is pledged to pay back money slowly over a long time?

A sinking-fund bond is designed to ensure that the issuer sets aside money over time to repay the bondholders at maturity. This type of bond requires the issuer to make periodic payments into a sinking fund, which is then used to retire the bond. The purpose of such a structure is to reduce the risk for investors by guaranteeing that funds will be available to pay back the principal amount, thereby spreading the payment obligations over the life of the bond rather than having a large lump-sum payment at maturity.

This approach offers a more manageable financial strategy for issuers and provides a level of security for bondholders, making it a favored option for long-term financing needs.