National debt, also known as national debt, is a creditor-debtor relationship formed by the state on the basis of its credit and in accordance with the general principles of debt.
National debt is a bond issued by the state and a government bond issued by the central government to raise financial funds.
It is a debt certificate issued by the central government to investors, promising to pay interest and repay the principal within a certain period of time.
Because the issuer of national debt is the country, it has the highest credit and is recognized as the safest investment tool.