First of all, Money' and 'currency' should not be used interchangeably. Currency is the money of a given state. In the U.S., it is Federal dollar notes in circulation. Money is what we use every day to pay our liabilities, and this includes currency and, to a much bigger extent, our bank account balances that provide the source for our check, wire transfer, debit card, and credit card payments.
On the other hand, Bitcoins are independent or what they term as decentralized, thus they are not controlled by the government or financial agencies. The absence of a central entity that controls bitcoins means that the bitcoins can be distributed in a powerful and resilient peer-to-peer network. It can also be transferred from bitcoin users to other users located across the globe without any problems.