This term represents a financial instrument that is used by two different parties to trade the difference between opening and closing price of one contract. (binaryminery.com)
When you buy or sell a CFD, you are making an agreement to trade the difference in the value of an underlying asset (sometimes called the «underlying security» or the «reference asset») between now and a future date. (moneysmart.gov.au)
Targeting the yield spread between U.S. and Canadian debt, which reached the narrowest since October, isn't as common as trading the difference between Treasuries and bunds. (business.financialpost.com)