Cryptocurrency is a digital or virtual currency that uses cryptography for security and operates independently of a central bank.

Cryptocurrencies are typically decentralized, meaning they are not controlled by any government or financial institution. Instead, they rely on a distributed ledger technology called blockchain, which records all transactions in a transparent and immutable way.

Some popular cryptocurrencies include Bitcoin, Ethereum, and Litecoin, but there are many others in circulation. Cryptocurrencies can be used for a variety of purposes, such as making purchases online, investing, and even as a store of value like gold.

However, they can also be volatile and subject to rapid price fluctuations, so it's important to do your own research and exercise caution when investing in them.