In CFD trading, you enter into a contract with a brokerage to exchange the difference in the value of an underlying asset from the time the contract is opened to when it is closed. If the market price moves in your favour, you could realise a profit. If the market moves against you, you will incur a loss. CFD trading is leveraged, involves an initial margin, buy/sell spreads, initial cost, holding costs (rollovers, swaps) etc.