I am considering the purchase of some bonds. According to Euroclear's website, these bonds are "debenture". I did a search on Yahoo! and here's what I find: "debenture definition â A promissory note or bond backed by the credit and earnings history of a corporation and not secured by a mortgage or lien on specific property." Is there a difference between debentures and conventional unsecured bonds ? From the above definition alone I fail to see it. I know that when looking for a bond ticker, Bloomberg also makes the difference between debentures and unsecured bonds, so there must be a difference I guess. Thank you.