bitcoin is introduce by satoshi nakamoto.its existence came into being by this man in 2008.betcoin is created as reward of payment.let me call bitcoin is a form of payment for product and service.now a day most of the online workers getting payment in the form of payment.

its sub unit is called satoshi.one satoshi is equal to 0.000000001 bitcoin.there are so many bank and onlines services which accept bitcoin and we can convert bitcoin into flat money of any country.