Cryptocurrency is n digital or virtual currency secured by cryptography, making it nearly impossible to counterfeit or double-spend. Unlike traditional currencies issued by governments, cryptocurrencies are decentralized, typically operating on a technology called blockchain—a distributed public ledger. Bitcoin, launched in 2009, was the first and remains the most well-known. Others like Ethereum, Ripple, and Litecoin have also gained prominence. Cryptocurrencies offer features like lower transaction fees for international payments, increased privacy, and protection against inflation, though they are subject to significant price volatility and regulatory uncertainties. They represent a revolutionary shift in how we perceive and interact with money.