Bitcoin is a digital currency that was created by Satoshi Nakamoto in 2009.It is created electronically and impossible to control it.This currency are not printed currency like dollars or euros.Running computer all around the world are producing it.Owing to this reason they are different from other currencies.
bitcoin is the new currency that any government can't control. in cryptocurrencies those people whose holding buying and selling are the one to dictate the price of the bitcoin, supply and demands is one major factor. FIAT is government base currencies which controls with so much power.