Bitcoin is a virtual and intangible currency. That is, you can not touch in any of its forms as with coins or bills, but can be used as a means of payment in the same way as these. With paper money, a central government decides to print and distribute the money. The Bitcoins do not have a central government.
The Bitcoin originated in 2008 when Satoshi Nakamoto, a pseudonym of one or more people, decided to launch a new electronic currency whose peculiarity is that it only served to perform operations within the network of networks. Bitcoin refers to both the currency and the protocol and the P2P network on which it relies.
The Bitcoin system operates as a peer to peer network, that is, anyone who uses Bitcoin is already part of the system, it is a part of the Bitcoin Bank.