Bonds
Typically, bonds are just a certificate or a record, an evidence of which the issuer or a group agrees to pay the investor in a certain period. Bonds can also be described as some sort of a loan, with all the information of the payback date and interest date.
There are a lot of corporations, local governments, federal agencies and the like who are practising these type of concept to finance. Millions of different types of bonds are being issued each year.
I got my money back
Bonds can also be a source of income, especially of retired people receiving money at regular intervals. Though, some bonds can be risky—like corporate bonds, unless the company has a good standing—bonds can be a good way of acquiring returns in the long run.