Bond is a financial instrument that represents a loan made by an investor to a borrower, typically a government or corporation. It is a type of fixed-income security that pays a regular interest rate to the investor and has a specified maturity date when the principal amount is returned. Bonds are often used by investors to diversify their portfolios and to generate income, and they are also commonly used by governments to finance public projects and by corporations to fund capital projects or acquisitions. The risk associated with bonds varies depending on the creditworthiness of the issuer and the terms of the bond itself.