Be sure to check out the definition of a bond first. Bonds are types of loans that companies, governments, and similar entities offer as a way to earn capital. A corporate bond, then, is issued by a company and sold to investors.
Example: Corporate bonds work like other bonds in that a company will sell a debt security to investors in order to raise capital (aka cash). Theyll set a pre-determined interest rate and a term for the bond. If you purchased the bond at a 3% interest rate with a 10-year term, youd receive 3% of whatever you purchased the bond for during those ten years.