Cryptocurrency is a digital or virtual form of money secured by cryptography, operating on decentralized blockchain technology. Unlike traditional currencies, crypto is not controlled by governments or banks, offering transparency and security. Bitcoin, the first cryptocurrency, was launched in 2009, followed by thousands of others like Ethereum, Solana, and Ripple. Crypto enables fast, low-cost cross-border transactions, smart contracts, and decentralized finance (DeFi) applications. However, its volatility, regulatory uncertainty, and risks of fraud remain challenges. Despite this, cryptocurrencies are gaining mainstream adoption as payment methods and investment assets, reshaping the future of finance with innovation and decentralization.