CDFs are a means by which commodities or many other products can be traded. They are derivative products which enable you to trade on the price movement of financial assets. You can trade CFDs if you believe the price of a financial instrument is likely to go up in value (strengthen) and if you think it is likely to go down (weaken). This is particularly useful in shares when you don’t need to own or borrow the underlying stocks as you would on a physical exchange.