Cryptocurrency is a digital or virtual form of currency that uses cryptography for security and operates on decentralized networks, typically built on blockchain technology. Unlike traditional currencies issued by governments, cryptocurrencies are not controlled by any central authority, making them resistant to censorship and manipulation. Popular cryptocurrencies like Bitcoin and Ethereum have gained global attention for their potential to revolutionize finance, enabling peer-to-peer transactions, smart contracts, and decentralized finance (DeFi) applications. While offering innovation and investment opportunities, cryptocurrency also faces challenges such as regulatory uncertainty, volatility, and security risks. As adoption grows, the future of crypto will depend on responsible development and regulation.