Bitcoin (BTC) is a digital currency, which is used and distributed electronically. Bitcoin is simply called a decentralised peer-to-peer network. No single institution or person controls it. Bitcoin connects buyers and sellers through encryption keys. And it isn't issued from the top down like traditional currency; rather, bitcoin is mined by powerful computers connected to the internet. Bitcoins has a fixed limited supply of just 21 million bitcoin ever, so unlike paper currency no more can be printed. Bitcoin was first introduced as an open-source software by an anonymous programmer, or a group of programmers, under the alias Satoshi Nakamoto in 2009. There has been a lot of rumours about the real identity of who invented bitcoin.