Cryptocurrency is a form of digital or virtual currency that uses cryptography for security. Unlike traditional money issued by governments, cryptocurrencies operate on decentralized networks based on blockchain technology. The most well-known cryptocurrency is Bitcoin, introduced in 2009. Since then, thousands of alternative cryptocurrencies have emerged, such as Ethereum, Litecoin, and Ripple. These digital assets can be used for online purchases, investment, or transferring money globally. Cryptocurrency markets are highly volatile, offering both risks and opportunities. Supporters believe cryptocurrencies represent the future of finance, while critics highlight concerns over regulation, security, and environmental impact due to energy-intensive mining processes.