Cryptocurrency is a decentralized digital currency that uses cryptography for security and operates independently of a central bank. Bitcoin is the most well-known cryptocurrency, but thousands of other cryptocurrencies exist, including Ethereum and Litecoin. Cryptocurrencies can be used for various purposes, such as a store of value or a speculative investment, but they have also faced criticism for their lack of regulation and potential for use in illegal activities. Despite uncertainties, cryptocurrencies will continue to play a vital role in the financial landscape.