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About CFD

New to shares. Understand there is such a thing for CFD (Contracts for Difference) whereby one can buy and sell without really owning the shares. From what I understand it is good for those active traders who like to shorts /contra am I right? Compare to traditional way, is it in anyway cheaper/better or faster to do so? How much shares can you actually purchase since you do not actually need "real" money to purchase?

Does anyone here uses that?