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Please explain: What exactly is a CDS or “Credit Default Swap”?
A Credit Default Swap is a derivative, a financial contract with a value dependent upon another asset. A CDS, in essence, is exactly what it sounds like a swap upon default. The typical arrangement is that a holder of non-risk free credit enters into an arrangement with a counterparty to pay the counterparty a portion of the income received from the non-risk free credit in exchange for being able to force the counterparty to deliver risk free credit if the non-risk free credit defaults. Banks use this mechanism to reduce the risk of the loans they produce while packaging them to be resold to investors.  Banks will typically buy CDSes on mortgages and corporate bonds, paying part of the income from interest payments received, to have the right to force counterparties, typically hedge funds and insurance companies, to swap national Treasuries upon the event that the mortgages or corporates default.  The banks receive less income yet are able to take on more inventory to sell to investors so that more loans can be made to borrowers, households and corporations. Hedge funds typically take on more complex arrangements while insurance companies sell CDSes because they are usually overflowing with risk-free assets yet are starved for income.