#EthereumSecurityInitiative Cryptocurrency is a digital or virtual currency that uses cryptography for security and is decentralized, meaning it's not controlled by any government or institution. Transactions are recorded on a public ledger called a blockchain, ensuring transparency and immutability. Popular cryptocurrencies include Bitcoin, Ethereum, and Litecoin. They offer benefits like fast and global transactions, potential for high returns, and diversification. However, they also come with risks like price volatility, security concerns, and regulatory uncertainty. As the market evolves, cryptocurrencies are becoming increasingly mainstream, attracting investors and users worldwide. Their impact on traditional finance is being closely watched.