Cryptocurrency is a form of digital or virtual currency that uses cryptography for security. Unlike traditional currencies issued by governments (such as the dollar or rupee), cryptocurrencies operate on decentralized networks based on blockchain technology. Bitcoin, launched in 2009, was the first cryptocurrency and remains the most well-known today. Others like Ethereum, Binance Coin, and Solana have also gained popularity. Cryptocurrencies allow for peer-to-peer transactions without the need for intermediaries like banks, making them faster and often cheaper. They are also praised for their transparency and security. However, the market is highly volatile and speculative, requiring careful research before investing.