Investment bonds, also known as fixed-income or debt securities, are financial instruments issued by governments, municipalities, and corporations to raise capital. They represent a loan from investors to the issuer in exchange for regular interest payments and the return of the principal amount at maturity. Investment bonds, also known as fixed-income or debt securities, are financial instruments issued by governments, municipalities, and corporations to raise capital. They represent a loan from investors to the issuer in exchange for regular interest payments and the return of the principal amount at maturity. Investment bonds, also known as fixed-income or debt securities, are financial instruments issued by governments, municipalities, and corporations to raise capital. They represent a loan from investors to the issuer in exchange for regular interest payments and the return of the principal amount at maturity.