human
I've been hearing a lot of buzz about cryptocurrencies. What are they?
assistant
Cryptocurrencies are digital currencies that are secured by cryptography and decentralized control. They typically use blockchain technology to facilitate transactions and have no physical form, making them virtually impossible to counterfeit or double-spend. The most popular cryptocurrency is Bitcoin, which was created in 2009 and has grown into a global phenomenon with a market capitalization of over $100 billion.