Bitcoin's most disrupting feature is its decentralized architecture. Indeed, bitcoin relies on a P2P network of computers to proceed money transfers. Each part of the network works to create new bitcoins ('mining'), keep the network alive and validate transactions.
All the transactions are registered in the blockchain that is used to validate a transaction using cryptography technology: it ensures that you can't use a bitcoin you don't own or you don't use the same bitcoin more than once. This last action previously required a third party, but with bitcoin this is not the case anymore: the network replaces financial institutions and banks.
