Cryptocurrency is a digital or virtual currency that relies on cryptographic techniques for security. Bitcoin, the first cryptocurrency, was launched in 2009, introducing a new decentralized model for finance. Unlike traditional currencies, cryptocurrencies operate independently of a central authority. They leverage blockchain technology, ensuring secure and transparent peer-to-peer transactions. The rise of cryptocurrencies has paved the way for decentralized finance (DeFi), where people can exchange value without intermediaries like banks. While volatile, cryptocurrencies have the potential to revolutionize global finance, providing financial inclusion and opening up new investment opportunities for millions of people worldwide.