Bitcoin is a digital currency, created and held electronically. Unlike any normal currency, Bitcoin is controlled by no one. Bitcoins are not printed, they are produced by people who run computers all over the world, using software that solves mathematical problems.
Regarding its use, Bitcoin is no different from other currencies – you can use it to purchase products and services online, just like with any other currency. Only that, you can also easily transfer it from one side of the world to the other, in less than 10 minutes, and with fees that are insignificant comparing to today’s banks. Bitcoin is a limited coin, on its peak Bitcoin will hold only 21 million bitcoins. As US dollar consists of cents, each bitcoin consists of Satoshis. One bitcoin equals a million Satoshi (0.0000001 bitcoin = 1 Satoshi).