Cryptocurrency is a type of digital or virtual currency that uses cryptography for security, making it difficult to counterfeit or double-spend. The most well-known cryptocurrency is Bitcoin, but there are thousands of others, such as Ethereum, Binance Coin, and Ripple (XRP).

Cryptocurrencies operate on decentralized networks based on blockchain technology, which is a distributed ledger enforced by a network of computers (or "nodes"). This decentralization removes the need for intermediaries like banks and governments, allowing peer-to-peer transactions. 

Some key features of cryptocurrency include:

- **Decentralization:** Most cryptocurrencies are not controlled by any single entity, such as a central bank or government.

- **Security:** Cryptography secures transactions, making them resistant to fraud and hacking.

- **Transparency:** Blockchain technology provides a transparent ledger, making it difficult to alter transaction records.

- **Anonymity:** While transactions are public on the blockchain, users can remain pseudonymous, depending on the cryptocurrency.

Cryptocurrencies have been praised for their potential to democratize finance, but they also face challenges, including volatility, regulatory scrutiny, and concerns about their use in illegal activities.

Are you interested in a particular aspect of cryptocurrency, such as how to invest or its underlying technology?