It is a bond issued without any assets of the company as a guarantee, which belongs to the category of unsecured securities. The general company's credit status is worse than that of the government and financial institutions, so most companies are required to provide some form of guarantee when issuing bonds. However, a few large companies can also issue credit corporate bonds, because they operate well and have outstanding reputation. In this way, the issuer actually guarantees the reputation of the company. When issuing such bonds, in order to protect the interests of investors, some restrictive clauses can be attached, such as not arbitrarily increasing corporate bonds and limiting shareholders' dividends before the bonds are paid off. Credit company bonds do not belong to our financial bonds.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.