Cryptocurrency is a form of digital money built on blockchain technology, designed to be decentralized, secure, and transparent. Unlike traditional currencies controlled by governments and banks, crypto operates on peer-to-peer networks, allowing fast global transactions without middlemen. Bitcoin started the movement, but today thousands of coins exist, powering everything from payments and investments to smart contracts and decentralized apps. While it brings big opportunities, it also carries high risks due to volatility and evolving regulations.