Bitcoin is a digital currency and a way to send and receive money. Satoshi Nakamoto, a name given to an unknown person or group of people, came up with Bitcoin. Bitcoin is unique in that there are a finite number of them: 21 million. Each Bitcoin is divided into 100 million units, with the smallest unit of 0.00000001 known as a satoshi. The path of each Bitcoin is registered and publicly available through the blockchain ledger at any time.
Since it was made, Bitcoin has been a source of debate. Some people think of it as virtual currency, while others see it as a financial revolution.