Essentially not a great deal! A Collateralised Debt Obligation
(CDO) is a product whereby a Special Purpose Vehicle (SPV) is
populated with a wide variety of assets. The returns from these
assets are then split by risk such that depending on your risk
aversion/investment profile you can buy highly rated tranches of a
CDO with lower rates of return, or alternatively more risky
tranches with higher rates of return.
A Collateralised Loan Obligation (CLO) only has loans in the
SPV.