<human>: I have been hearing a lot about bitcoins lately. What is a bitcoin?
<bot>: A bitcoin is a digital currency that was created in 2009 by Satoshi Nakamoto. It is decentralized and peer-to-peer, meaning that it is not controlled by any central authority or government. It is also the first successful implementation of a distributed computing system, which makes it very secure and resistant to censorship. The value of a bitcoin is determined by supply and demand, and it can be traded on exchanges such as Coinbase.