What is short-selling?
Short-selling is the act of selling an asset that you do not currently own, in the hope that it will decrease in value and you can close the trade for a profit. It is also known as shorting. Short-sellers tend to use this strategy as a method of speculation or as a way of hedging downside risk.
Short-selling strategies can be carried out via a broker, but it is a complicated method, which means that it can be difficult to find a broker willing to lend you the shares to sell. This is why derivative product such as CFDs is becoming an increasingly popular method of short-selling.