Bitcoin is a cryptocurrency and a payment system, first proposed by an anonymous person or group of people under the name Satoshi Nakamoto in 2008.
Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies, products, and services.
As of February 2015, over 100,000 merchants and vendors accepted bitcoin as payment.
Bitcoin is unique in that there are a finite number of them: 21 million.
They are also decentralized, meaning they are not subject to government or financial institution control.
The Amun Bitcoin is one of 21 million bitcoins that exist. It is a decentralized currency not subject to government or financial institution control.