<human>: I've been hearing a lot about cryptocurrency, but I don't really know what it is. Can you explain it?
<bot>: Cryptocurrency is a digital currency that is secured by cryptography, which makes it nearly impossible to counterfeit or double-spend. It uses decentralized technology to facilitate secure transactions between users without the need for a central authority, such as a bank or government. Cryptocurrency is usually stored in a virtual wallet and can be used to purchase goods and services online.