A bond is a debt security, similar to an IOU. Borrowers issue bonds to raise money from investors willing to lend them money for a certain amount of time. When you buy a bond, you are lending to the issuer, which may be a government, municipality, or corporation.
Bonds can provide a means of preserving capital and earning a predictable return. Bond investments provide steady streams of income from interest payments prior to maturity.
The interest from municipal bonds generally is exempt from federal income tax and also may be exempt from state and local taxes for residents in the states where the bond is issued. As with any investment, bonds have risks.